How to fix app store Mountain Lion download that stops at 45%? I have tried to download Mountain Lion from the app store only to have it show up in my dock and begin "downloading". Except it never completes the download. Each time I begin the download again, it gets a bit farther, but after about 45% it won't download any more data, even after waiting 12 hours. My Mac is most definitely compatible and my colleagues on the same model/version of the machine I am using have downloaded and installed Mountain Lion without any issues.

I have:


Repaired permissions
Installed all the most recent Mac updates for Snow Leopard
Restarted the computer
Cleared my App Store cache


No error messages, just won't complete the download. I'm afraid if I call Apple for help they will charge me for a product I have paid for, but doesn't work.

How to completely download Mountain Lion from the app store?
I spoke to the Apple Store, and it had to do with a faulty harddrive which came out in my model. I went through the Hard Drive Replacement Program, and all went well, with Mountain Lion installed.