I don't know why but I can't download Borderlands GOTY. I tried and it says this product is damaged please reinstall borderlands GOTY. I tried once again and it said the same thing. Then I tried a third time and now it won't install. It just says reinstall app in the Purchases list.
MacBook Pro with Retina display, OS X Mountain Lion (10.8.2), 399 GB out of 500 GB left