HT202159 Whilst downloading mountain lion - I get in red "An error has occurred" and no ability to resume the download - amy ideas?

I am trying to download mountain lion on to a mac pro but the message I get is just an error has occurred. any suggestions are very welcome.

I was having this problem - I assumed it was the Apple server being overloaded, so I just kept retrying over the last couple of days.  All my apps were upto date, so was Software Update.  i tried logging out of the App Store, restarting and so on.  No joy.
Anyway, eventually I did this, and it seems to have solved the problem.
Sign out of the App Store (in the Store menu)
Quit the App Store
In Finder - Go>Go to folder...  (or Apple-shift-G)
Paste in the following "~/Library/Caches/com.apple.appstore"
It will take you to a folder.  Delete the whole folder and empty the trash.
Launch the App Store.  Sign in and then reclick the Mountain Lion buy.  It won't charge you again.  It then started downloading.  I'm currently 5% downloaded - but I never got this far before.
Hope this helps!

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