macOS 10.14 mojave安裝低版本iTunes 12.6.x

下載iTunes 12.6版本：https://support.apple.com/zh-cn/HT208079

安裝低版本iTunes

利用腳本編輯器運行腳本安裝低版本iTunes：

關閉SIP系統完整性保護

• 打開Mac終端輸入命令：csrutil status

$ csrutil status

• 默認情況下是開啓的

System Integrity Protection status: enabled.

• 重啓電腦，按住鍵盤上面的cmmand+r，進入修復模式
  點擊實用工具，選擇終端

  
  

輸入命令：csrutil disable

$ csrutil disable

• 再次重啓電腦

• 建議這裏記得安裝完成後改回來，開啓SIP和前面的操作一致，在修復模式下，輸入命令csrutil enable

$ csrutil enable

打開腳本編輯器，將以下代碼複製到腳本編輯器運行（卸載iTunes並重裝）

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

運行後根據提示卸載安裝。

如果提示 iTunes Library.itl 錯誤，打開終端運行命令：sudo rm ~/Music/iTunes/iTunes\ Library.itl

$ sudo rm ~/Music/iTunes/iTunes\ Library.itl

或者：

display dialog "Please select iTunes 12.6 dmg file" 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"

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

運行腳本卸載iTunes後，按照腳本提示選擇12.6版本iTunes的安裝包進行安裝即可。