"This item is temporarily unavailable - Try again later" (Dec 2013)

Question

A few days ago, I reset my imac (21.5 inch - mid 2010) to factory settings, and now I cannot download from iTunes, music that I've brought.
When I first opened iTunes, it was empty (of course), so I tried pressing the "Check for Available Downloads" button and a window popped up saying "All purchases have been downloaded for this Apple ID", but, my library was still empty, and it was not downloading anything.
After searching on some forums and looking through some posts, I finally managed to make the albums/music show up in my library: I activated "Show iTunes in the Cloud purchases". Now that the music was in the library, I though I'd be able to play it, but no... Instead when either trying to double click the albums to start the music or when I tried to press the iCloud image in the top-right of the album covers, and error showed up (image below). I looked, again, on the internet for suggestions or solutions, but couldn't find any. I only saw post back from 2010 with similar problems, and the instructions there seemed a little bit outdated (I tried them anyways, but didn't work - not surprised)
I have checked the app store, and everything seems to be updated to the latest version...
As you can see on the screenshot, it tries downloading the music, but is failing and the status goes from " -- loading bar --" to "stop". "Resuming" just restarts the process.
Need help ASAP.

Answer 1

Hey there Mentin,
It sounds like you are having difficulty downloading a previous purchase or two from the same album but others work fine. I would try signing out of the iTunes Store, then restart your computer, sign back in and try again.
Sign Out:
Choose Store > Sign In (or Sign Out).
From: iTunes 11 for Mac
          http://support.apple.com/kb/PH12299
If the issue persists, I would next reach out to our iTunes Store support and report an issue:
How to report an issue with your iTunes Store, App Store, Mac App Store, or iBooks Store purchase
http://support.apple.com/kb/ht1933
Find the email receipt for your purchase.
Click Report a Problem under the app that is having the issue.
When prompted, enter the Apple ID and password you used to purchase the item, then click Report a Problem.
Click Report a Problem next to the item you are having an issue with.
From the Choose Problem dropdown menu, choose the appropriate issue.
Follow the onscreen instructions and—if prompted—type a description of the problem into the text field.
Click Submit to have your issue reviewed.
Thank you for using Apple Support Communities.
All the very best,
Sterling