5将下面的代码粘贴进去：
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
注重：代码要直接复制粘贴，不要手动输入
