Xcode 4.1 GM Not Installing (must quit iTunes) on Lion?

I am trying to install Xcode 4.1 GM on my Lion mac but it's not working. When it is almost finished, I get the popup to quit iTunes even though it is already quit. So the only option I have is to quit iTunes helper or alert in activity monitor, then it finishes the 开发者_如何学JAVAinstall. However then Xcode crashes on launch. Any ideas?

You can go into Activity Monitor and Quit the iTunes helper. That will also get Xcode to finish.

Looks like you've solved the install problem. It's not a solution per se, but setting Xcode to run in 32-bit mode fixed the crashing problem for me.

It's too early to say what the trade-off is (if any), but whatever it is, it's bound to be better than not being able to use it at all.

On a side note: please accept Phil's answer since he gave the correct solution to your original problem. C:

if you boot into single user mode (Press S when starting up), the installation works as it should. Xcode will then function without switching it to 32-bit mode.

Open "Activity Monitor" (press Command+Space to bring up spotlight, or find it in Applications.)

Sort by Process Name and find the process called "iTunesHelper".

From the "View" menu choose "Quit Process".

Then click on the "Force Quit" button. Xcode installation should continue now.

Try to use the xCode through the Finder after you get this problem. It happened to me, but I can still run the xCode.

I think it's something to do with your version of itunes is more updated than your Mac Os version.