I had a problem like that. There are three versions of CS6. Perpetual version 220.127.116.11 Windows, Perpetual version 13.0.6 Mac and Subscription version 13.1.2.
I had Perpetual version 18.104.22.168 windows install one my machine and wanted to keep the intact foe Subscription version 13.1.2 has some differences that I doe not want. Perpetually Windows version version 22.214.171.124 cant use the optional cs5 Plug-ins Web Photo galleries and Picture Package where these plug-in do not work with subscription version 13.1.2..
I did not Ask the Creative Cloud Desktop Application to update CS6. I did not want it updated. However at some Point in time the creative cloud tried to update my CS6. Instead the update broke the existing CS6 version 126.96.36.199 and CS6 then reported it was at level 13.0. A very buggy version broken version of CS6. Any attempt to Update CS6 resulted in the error message U44M1P7 which indicates the installation is bad.
To fix the Problem I installed CS6 on top of the broken install. Reinstalling CS6 fixed the broken CS6 install. CS6 was back leveled to the buggy CS6 version 13.0. I was then able to update CS6. CS6 updated to the subscription version 13.1.2. The version of CS6 I did not want. It works however, it can not use the old CS5 optional Plug-in. If does have a Scripting bug fix for a problem I reported which is not fixed in Version 188.8.131.52.
It does not matter much for I use CC 2014 whoch is a better version version of Photoshop. Newer Photoshop version have bugs that bite when I user them..
Thank you for replying. My case differs from yours in that PS CS6 still reports itself as 13.0.6 Mac, and it still works in a small test case. But I do have one further Q: when you "installed CS6 on top of the broken install", how/where did you obtain the CS6 installer to do so?
Thanks for the help,
You are getting the error code I got that indicate your Photoshop installation has been corrupted. I still think you need to re-install CS6 back to version 13.0 and update that install..
Thank you. Where do I get a Photoshop 13.0 installer?