问题
My Mac has snow leopard version 10.6.8. I have installed Xcode 3.2.5, can I update to xcode 4.2 with my present OS version?
回答1:
No, not possible, you need the latest version of Mac OSX: Snow Lion (10.8) to run xCode 4.2. Luckily, the upgrade isn't that expensive, and is said to be worth the money (have bought the upgrade already, but not installed it myself :-) )
回答2:
Yes, you can. 4.2 is the last XCode version that supports Snow Leopard, you'll need a later OS version to use anything newer. You'll need a developer account to download it from Apple however. I'm not saying that you NEED to download it from Apple though. I leave the rest to your imagination.
来源：https://stackoverflow.com/questions/12086671/can-i-install-xcode-4-2-on-osx-10-6-8-snow-leopard