Please note that only Apple applications are optimized for Retina display e.g. Safari, iPhoto etc. PSE is not.
Did you ever get a useful response to your question?
I have the same laptop and lost my Acrobat Pro when my drive overheated on my old Mac.
All I want is to download a copy of my (purchased) product and the only options here on the site are for trial versions.
On Microsoft, you open your account, click your product, enter your key and your purchase is downloaded.
Surely Adobe has the ability to provide the same service? Not all computers have a disk drive.