I've found the solution. Apperantly this is a general App Store problem applicable to program downloads issues. I used suggestion from this message by bjbesthttps://discussions.apple.com/thread/3118115?answerId=15661563022#15661563022:
Jun 11, 2011 I have OSX 10.5.8 on my computer, and I'm taking a C programming class right now. I'd like a good IDE that works in the language, and almost all sources tell me XCode is the best available on a mac, and the industry standard. However, looking up XCode on apple's site shows only the latest.
1. Open Terminal
2. Enter
3. Relaunch the AppStore
4. Choose the menu item Debug Menu -> Reset App
5. Choose the menu item Debug Menu -> Check for Available Downloads…
and also change DNSs to those of Google's as was also suggested in the thread https://discussions.apple.com/thread/3118115
Hope it helps!
Cheers!
Oct 5, 2012 8:39 AM
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Xcode For Os X 10.10.5
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