[Mac]安装iTunes 12.6.20

2020.03.19更新

最佳解决方案

系统版本升级到10.15 Catalina后安装Retroactive,打开后安装包含商店版本的iTunes即可。亲测有效(不适用与10.14 Mojave及更早版本)

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2020.02.28更新

警告

通过此方法安装12.6.20版本，有概率出现iTunes无法链接苹果服务的情况，一般修复此情况只能系统还原，请谨慎操作。

操作方法

1. 下载目标版本iTunes。也可通过此链接下载(此系苹果官网下载所得)，提取码: pf6u。

2. 关闭SIP。
   首先将电脑关机，按住组合键command+R 开机进入macOS的恢复模式（Recovery HD）。
   进入的时候读条可能很慢耐心等待。之后找到顶部菜单栏的实用工具–终端，打开它。输入：
   csrutil disable。

3. 打开终端，使用命令行删除iTunes。

   sudo rm -rf /Library/Documentation/Applications/iTunes/Acknowledgements.rtf /Library/Documentation/iPod/Acknowledgements.rtf /Library/Frameworks/iTunesLibrary.framework/ /Applications/iTunes.app/ /System/Library/PrivateFrameworks/iTunesAccess.framework/ /System/Library/LaunchDaemons/com.apple.fpsd.plist /System/Library/PrivateFrameworks/CoreFP.framework/ /System/Library/PrivateFrameworks/CoreADI.framework/ /System/Library/LaunchDaemons/com.apple.adid.plist /System/Library/CoreServices/UAUPlugins/ADIUserAccountUpdater.bundle/ /System/Library/CoreServices/CoreTypes.bundle/Contents/Library/MobileDevices.bundle/ /System/Library/LaunchDaemons/com.apple.usbmuxd.plist /System/Library/PrivateFrameworks/AirTrafficHost.framework/ /System/Library/PrivateFrameworks/DeviceLink.framework/ /System/Library/PrivateFrameworks/MobileDevice.framework/ /System/Library/Extensions/AppleMobileDevice.kext/ /System/Library/Extensions/AppleUsbEthernetHost
   

4. “启动台” - “其他” 文件夹 - 启动 “脚本编辑器”，复制下面代码并运行，安装12.6.20。

   set question to display dialog "Delete iTtunes?" buttons {"Yes", "No"} default button 1
   set answer to button returned of question
   if answer is equal to "Yes" then
       do shell script "rm -rf /Applications/iTunes.app" with administrator privileges
       display dialog "iTunes was deleted" buttons {"Ok"}
       set theDMG to choose file with prompt "Please select iTunes 12.6 dmg file:" of type {"dmg"}
       do shell script "hdiutil mount " & quoted form of POSIX path of theDMG
       do shell script "pkgutil --expand /Volumes/iTunes/Install\\ iTunes.pkg ~/tmp"
       do shell script "sed -i '' 's/18A1/14F2511/g' ~/tmp/Distribution"
       do shell script "sed -i '' 's/gt/lt/g' ~/tmp/Distribution"
       do shell script "pkgutil --flatten ~/tmp ~/Desktop/iTunes.pkg"
       do shell script "hdiutil unmount /Volumes/iTunes/"
       do shell script "rm -rf ~/tmp"
   end if
   if answer is equal to "No" then
       display dialog "iTunes was not deleted" buttons {"Ok"}
       return
   end if
   
   set question to display dialog "Install iTtunes?" buttons {"Yes", "No"} default button 1
   set answer to button returned of question
   if answer is equal to "Yes" then
       do shell script "open ~/Desktop/iTunes.pkg"
       return
   end if
   if answer is equal to "No" then
       display dialog "Modified iTunes.pkg saved on desktop" buttons {"Ok"}
       return
   end if
   

5. 打开应用程序-iTunes-显示包内容，替换Info.plist,version.plist，提取码: pf6u。

6. 在iTunes.app上右键，显示简介，先不要关闭简介窗口。然后还在iTunes.app上右键，显示包内容，找到Contents/Resources/iTunes.icns, 把这个文件拖入刚才的简介的窗口的左上角图标处，重新打开iTunes就不会是禁止图标了。

7. 完成所有iTunes旧版安装步骤后，将电脑关机，按住组合键command+r开机进入macOS的恢复模式（Recovery HD）。之后找到顶部菜单栏的实用工具–终端，打开它。输入：
   csrutil ensable开启系统完整性保护。

Fix

1. 如果打开 iTunes 12.6 提示无法读取文件“iTunes Library.itl”，因为它是由更高版本的 iTunes 所创建。

   解决方法：点击“退出”按钮，打开文件夹/Users/管理员名称/Music/iTunes，删除 “iTunes Library.itl” 文件即可。或者直接sudo rm -rf ~/Music/iTunes/iTunes Library.itl一步到位。

2. 打开iTunes时出现 an unknown errer occurred（-45076)。

   解决方法：打开终端，复制一下代码删除iTunes。

   sudo rm -rf /Library/Documentation/Applications/iTunes/Acknowledgements.rtf /Library/Documentation/iPod/Acknowledgements.rtf /Library/Frameworks/iTunesLibrary.framework/ /Applications/iTunes.app/ /System/Library/PrivateFrameworks/iTunesAccess.framework/ /System/Library/LaunchDaemons/com.apple.fpsd.plist /System/Library/PrivateFrameworks/CoreFP.framework/ /System/Library/PrivateFrameworks/CoreADI.framework/ /System/Library/LaunchDaemons/com.apple.adid.plist /System/Library/CoreServices/UAUPlugins/ADIUserAccountUpdater.bundle/ /System/Library/CoreServices/CoreTypes.bundle/Contents/Library/MobileDevices.bundle/ /System/Library/LaunchDaemons/com.apple.usbmuxd.plist /System/Library/PrivateFrameworks/AirTrafficHost.framework/ /System/Library/PrivateFrameworks/DeviceLink.framework/ /System/Library/PrivateFrameworks/MobileDevice.framework/ /System/Library/Extensions/AppleMobileDevice.kext/ /System/Library/Extensions/AppleUsbEthernetHost