How do I re-download Acrobat Pro?

In 2014, I purchased, downloaded and installed Adobe Acrobat XI Pro Student and Teacher Edition.  Back in November, my MacBook Pro was stolen, and I restored my stuff onto a new MacBook Air.  I just tried to open Acrobat, and I was instructed to uninstall and reinstall (“Error 1”).  Having uninstalled, I want to re-download my purchase.  How do I do that?