Here is a picture list of all the changes logged by my backup program after the X2a Patch.
I own Sonar X2 Producer so the changes are based on that. Previously I had the X2 'quickfix' patch installed.
I tried to find all the references to changes but I may have missed a few.

Changes to 64-bit program files:





Changes to ProgramData:






Changes to 32-bit VST data:






Changes to 64-bit VST data: