diff --git a/source/_posts/demo/comment/LiveRe.md b/source/_posts/demo/comment/LiveRe.md
deleted file mode 100644
index cb2f5a4..0000000
--- a/source/_posts/demo/comment/LiveRe.md
+++ /dev/null
@@ -1,23 +0,0 @@
-title: LiveRe Comment Plugin
-date: 2015-01-01
-tags:
-- Demo
-comment:
-    type: livere
-    uid: MTAyMC8zNTExMS8xMTY0Ng==
----
-
-<article class="message message-immersive is-warning">
-<div class="message-body">
-<i class="fas fa-exclamation-triangle mr-2"></i>This page is for demonstration only.
-Please report your issues with this plugin to 
-<a href="https://github.com/ppoffice/hexo-component-inferno">ppoffice/hexo-component-inferno</a>.
-</div>
-</article>
-
-<article class="message message-immersive is-primary">
-<div class="message-body">
-<i class="fas fa-info-circle mr-2"></i>
-Please turn off your ad blockers if you do not see the comment section.
-</div>
-</article>
diff --git a/source/_posts/demo/comment/Valine.md b/source/_posts/demo/comment/Valine.md
index 4a663f3..5553771 100644
--- a/source/_posts/demo/comment/Valine.md
+++ b/source/_posts/demo/comment/Valine.md
@@ -4,8 +4,8 @@ tags:
 - Demo
 comment:
     type: valine
-    app_id: QuQK82UpN8gNkXIaKIszbPUY-gzGzoHsz
-    app_key: B0D5cYRcXrwNGnBoQdRoDTqw
+    app_id: sLMlQ21EdIaShsDQVH34Rqo4-MdYXbMMI
+    app_key: 0FTrsBsfsjE2SyMOzXFWEfkl
     placeholder: ""
     avatar:
     avatar_force: false
@@ -14,6 +14,7 @@ comment:
     visitor: false
     highlight: true
     record_ip: false
+    server_urls: https://slmlq21e.api.lncldglobal.com
 ---
 
 <article class="message message-immersive is-warning">
diff --git a/source/_posts/demo/share/BaiduShare.md b/source/_posts/demo/share/BaiduShare.md
deleted file mode 100644
index b82608e..0000000
--- a/source/_posts/demo/share/BaiduShare.md
+++ /dev/null
@@ -1,21 +0,0 @@
-title: Baidu Share Buttons
-date: 2014-01-01
-tags:
-- Demo
-share:
-    type: bdshare
----
-
-<article class="message message-immersive is-warning">
-<div class="message-body">
-<i class="fas fa-exclamation-triangle mr-2"></i>This page is for demonstration only.
-Please report your issues with this plugin to 
-<a href="https://github.com/ppoffice/hexo-component-inferno">ppoffice/hexo-component-inferno</a>.
-</div>
-</article>
-
-<article class="message message-immersive is-primary">
-<div class="message-body">
-<i class="fas fa-info-circle mr-2"></i>Please turn off your ad blockers if you do not see the buttons.
-</div>
-</article>
diff --git a/source/_posts/en/Comment-Plugins.md b/source/_posts/en/Comment-Plugins.md
index 1a63ab3..0e62564 100644
--- a/source/_posts/en/Comment-Plugins.md
+++ b/source/_posts/en/Comment-Plugins.md
@@ -9,7 +9,7 @@ language: en
 toc: true
 ---
 
-This article covers comment plugins supported by Icarus 3.
+This article covers comment plugins supported by Icarus 4.
 
 <article class="message message-immersive is-primary">
 <div class="message-body">
@@ -318,9 +318,7 @@ However, unlike the other services, Isso requires a web host for running the Iss
 </div>
 </article>
 
-<div>
-<strong>Installation Guide</strong><a class="tag is-success ml-2" href="{% post_path demo/comment/LiveRe %}">Preview</a>
-</div>
+**Installation Guide**
 
 1. First, log into [LiveRe](https://livere.com/).
    Click "Install" on the navigation bar to go to the installation page.
diff --git a/source/_posts/en/Donation-Buttons.md b/source/_posts/en/Donation-Buttons.md
index 337637b..abb0026 100644
--- a/source/_posts/en/Donation-Buttons.md
+++ b/source/_posts/en/Donation-Buttons.md
@@ -29,7 +29,7 @@ donates:
         qrcode: /gallery/donate/wechat.jpg
 ---
 
-This article covers donation button configurations supported by Icarus 3.
+This article covers donation button configurations supported by Icarus 4.
 If you need to display multiple donation buttons at once, add individual button configuration
 to the `donates` array like the following:
 
diff --git a/source/_posts/en/FAQ.md b/source/_posts/en/FAQ.md
index b40820e..d300ba8 100644
--- a/source/_posts/en/FAQ.md
+++ b/source/_posts/en/FAQ.md
@@ -32,8 +32,8 @@ I can't generate my site. / I met some errors when I generate my site.
 </div>
 </article>
 
-Icarus 3 runs on Node.js 8.3.0 or a newer version.
-It also requires Hexo 4.2.0 or a newer version.
+Icarus 4 runs on Node.js 12.4.0 or a newer version.
+It also requires Hexo 5.0.2 or a newer version.
 Apart from that, make sure you have all the Node.js dependencies installed.
 You can find them in the `peerDependencies` section of the 
 [`<icarus_directory>/package.json`](https://github.com/ppoffice/hexo-theme-icarus/blob/master/package.json)
diff --git a/source/_posts/en/Other-Plugins.md b/source/_posts/en/Other-Plugins.md
index 84b7283..229f40b 100644
--- a/source/_posts/en/Other-Plugins.md
+++ b/source/_posts/en/Other-Plugins.md
@@ -24,7 +24,7 @@ plugins:
     progressbar: true
 ---
 
-This article covers other plugins supported by Icarus 3.
+This article covers other plugins supported by Icarus 4.
 
 <article class="message message-immersive is-primary">
 <div class="message-body">
diff --git a/source/_posts/en/Search-Plugins.md b/source/_posts/en/Search-Plugins.md
index 4a230e8..28e2dd6 100644
--- a/source/_posts/en/Search-Plugins.md
+++ b/source/_posts/en/Search-Plugins.md
@@ -9,7 +9,7 @@ language: en
 toc: true
 ---
 
-This article covers search plugin configurations supported by Icarus 3.
+This article covers search plugin configurations supported by Icarus 4.
 
 <article class="message message-immersive is-primary">
 <div class="message-body">
diff --git a/source/_posts/en/Share-Buttons.md b/source/_posts/en/Share-Buttons.md
index 754acf4..fb23c6e 100644
--- a/source/_posts/en/Share-Buttons.md
+++ b/source/_posts/en/Share-Buttons.md
@@ -12,7 +12,7 @@ share:
     install_url: //s7.addthis.com/js/300/addthis_widget.js#pubid=ra-5e8fc96750876c7d
 ---
 
-This article covers share buttons supported by Icarus 3.
+This article covers share buttons supported by Icarus 4.
 
 <article class="message message-immersive is-primary">
 <div class="message-body">
@@ -186,9 +186,7 @@ Use other services as alternatives.
 </div>
 </article>
 
-<div>
-<strong>Installation Guide</strong><a class="tag is-success ml-2" href="{% post_path demo/share/BaiduShare %}">Preview</a>
-</div>
+**Installation Guide**
 
 1. You can activate Baidu Share without user registration.
    Just put the following code to your theme configurations:
diff --git a/source/_posts/en/Upgrade-Guide.md b/source/_posts/en/Upgrade-Guide.md
index a7621eb..b24e315 100644
--- a/source/_posts/en/Upgrade-Guide.md
+++ b/source/_posts/en/Upgrade-Guide.md
@@ -15,11 +15,11 @@ toc: true
 
 <!-- more -->
 
-### Upgrading from 3.x to 4.0
+### Upgrading from 3.x to 4.x
 
 1. Upgrade Node.js to 10.13.0 or a newer version.
 
-2. Install Icarus 4.0 either via source code dowload or NPM install.
+2. Install Icarus 4.x either via source code dowload or NPM install.
    You can find instructions in {% post_link en/Getting-Started %}.
    If you plan to customize the theme by altering its source code, you are required to install
    the theme from source code.
diff --git a/source/_posts/en/Web-Analytics-Plugins.md b/source/_posts/en/Web-Analytics-Plugins.md
index 0685354..fd0aa24 100644
--- a/source/_posts/en/Web-Analytics-Plugins.md
+++ b/source/_posts/en/Web-Analytics-Plugins.md
@@ -9,7 +9,7 @@ language: en
 toc: true
 ---
 
-This article covers web analytics plugins supported by Icarus 3.
+This article covers web analytics plugins supported by Icarus 4.
 
 <article class="message message-immersive is-primary">
 <div class="message-body">
diff --git a/source/_posts/en/Widgets.md b/source/_posts/en/Widgets.md
index fb31606..cb74a9e 100644
--- a/source/_posts/en/Widgets.md
+++ b/source/_posts/en/Widgets.md
@@ -56,7 +56,7 @@ widgets:
         index: false
 ---
 
-This article covers widgets supported by Icarus 3.
+This article covers widgets supported by Icarus 4.
 To display multiple widgets at once, simply add individual widget configuration
 to the `widgets` array.
 They will appear in the order of their definitions.
diff --git a/source/_posts/zh-CN/Comment-Plugins.md b/source/_posts/zh-CN/Comment-Plugins.md
index 818a1f6..9d33fad 100644
--- a/source/_posts/zh-CN/Comment-Plugins.md
+++ b/source/_posts/zh-CN/Comment-Plugins.md
@@ -13,7 +13,7 @@ providers:
     iconcdn: loli
 ---
 
-本文介绍Icarus 3支持的用户评论插件的安装配置。
+本文介绍Icarus 4支持的用户评论插件的安装配置。
 
 <article class="message message-immersive is-primary">
 <div class="message-body">
@@ -317,9 +317,7 @@ providers:
 </div>
 </article>
 
-<div>
-<strong>安装指南</strong><a class="tag is-success ml-2" href="{% post_path demo/comment/LiveRe %}">在线预览</a>
-</div>
+**安装指南**
 
 1. 首先，登录[LiveRe](https://livere.com/)。
    点击导航栏上的“安装”(Install)链接，进入安装界面。
diff --git a/source/_posts/zh-CN/Donation-Buttons.md b/source/_posts/zh-CN/Donation-Buttons.md
index d6595b9..6493d57 100644
--- a/source/_posts/zh-CN/Donation-Buttons.md
+++ b/source/_posts/zh-CN/Donation-Buttons.md
@@ -33,7 +33,7 @@ providers:
     iconcdn: loli
 ---
 
-本文介绍Icarus 3支持的赞赏按钮的安装配置。
+本文介绍Icarus 4支持的赞赏按钮的安装配置。
 若需同时展示多个按钮，只需像如下这样在主题配置的`donates`数组中添加多个按钮配置：
 
 {% codeblock _config.icarus.yml lang:yaml %}
diff --git a/source/_posts/zh-CN/Other-Plugins.md b/source/_posts/zh-CN/Other-Plugins.md
index 1312821..bae9880 100644
--- a/source/_posts/zh-CN/Other-Plugins.md
+++ b/source/_posts/zh-CN/Other-Plugins.md
@@ -28,7 +28,7 @@ providers:
     iconcdn: loli
 ---
 
-本文介绍Icarus 3支持的其他插件的安装配置。
+本文介绍Icarus 4支持的其他插件的安装配置。
 
 <article class="message message-immersive is-primary">
 <div class="message-body">
diff --git a/source/_posts/zh-CN/Search-Plugins.md b/source/_posts/zh-CN/Search-Plugins.md
index a16792d..5d37154 100644
--- a/source/_posts/zh-CN/Search-Plugins.md
+++ b/source/_posts/zh-CN/Search-Plugins.md
@@ -13,7 +13,7 @@ providers:
     iconcdn: loli
 ---
 
-本文介绍Icarus 3支持的站内搜索插件的安装配置。
+本文介绍Icarus 4支持的站内搜索插件的安装配置。
 
 <article class="message message-immersive is-primary">
 <div class="message-body">
diff --git a/source/_posts/zh-CN/Share-Buttons.md b/source/_posts/zh-CN/Share-Buttons.md
index 01e1d15..1a5f7f6 100644
--- a/source/_posts/zh-CN/Share-Buttons.md
+++ b/source/_posts/zh-CN/Share-Buttons.md
@@ -16,7 +16,7 @@ providers:
     iconcdn: loli
 ---
 
-本文介绍Icarus 3支持的分享按钮的安装配置。
+本文介绍Icarus 4支持的分享按钮的安装配置。
 
 <article class="message message-immersive is-primary">
 <div class="message-body">
@@ -180,10 +180,7 @@ providers:
 </div>
 </article>
 
-<div>
-<strong>安装指南</strong>
-<a class="tag is-success" style="margin-left:.8em" href="{% post_path demo/share/BaiduShare %}">在线预览</a>
-</div>
+**安装指南**
 
 1. 你可以启用百度分享按钮而无需注册用户。
    直接将下面的代码添加到你的主题配置中：
diff --git a/source/_posts/zh-CN/Upgrade-Guide.md b/source/_posts/zh-CN/Upgrade-Guide.md
index 4560176..d9acc83 100644
--- a/source/_posts/zh-CN/Upgrade-Guide.md
+++ b/source/_posts/zh-CN/Upgrade-Guide.md
@@ -19,11 +19,11 @@ toc: true
 
 <!-- more -->
 
-### 从3.x升级至4.0
+### 从3.x升级至4.x
 
 1. 将Node.js升级到10.13.0或者更新的版本。
 
-2. 下载源代码或者从NPM安装Icarus 4.0。
+2. 下载源代码或者从NPM安装Icarus 4.x。
    你可以在{% post_link zh-CN/Getting-Started %}中找到安装指导。
    如果你打算通过修改源代码的方式自定义主题，你必须从源代码安装主题。
 
diff --git a/source/_posts/zh-CN/Web-Analytics-Plugins.md b/source/_posts/zh-CN/Web-Analytics-Plugins.md
index e9f723a..8881a61 100644
--- a/source/_posts/zh-CN/Web-Analytics-Plugins.md
+++ b/source/_posts/zh-CN/Web-Analytics-Plugins.md
@@ -13,7 +13,7 @@ providers:
     iconcdn: loli
 ---
 
-本文介绍Icarus 3支持的网站统计与分析插件的安装配置。
+本文介绍Icarus 4支持的网站统计与分析插件的安装配置。
 
 <article class="message message-immersive is-primary">
 <div class="message-body">
diff --git a/source/_posts/zh-CN/Widgets.md b/source/_posts/zh-CN/Widgets.md
index 014801d..4d6e692 100644
--- a/source/_posts/zh-CN/Widgets.md
+++ b/source/_posts/zh-CN/Widgets.md
@@ -60,7 +60,7 @@ providers:
     iconcdn: loli
 ---
 
-本文介绍Icarus 3支持的页面挂件的安装配置。
+本文介绍Icarus 4支持的页面挂件的安装配置。
 若要同时展示多个挂件，只需在主题配置的`widgets`数组中添加多个挂件配置。
 它们会按照定义的顺序出现。
 每个挂件必须包含`type`(挂件类型)与`position`(挂件展示位置)设置项。