I found an old post in the Code Composer Forum ("CCSv5.1, Refactor, Upgrade RTSC Product Versions") and some answers.
I can say that problems in upgrading RTCS are still there; if one happens to refactor a project, personal repository paths will vanish and then custom platforms and so on, leading to compiler and/or linker errors (of course). And making one lose a lot of time ...
Better change Build settings manually.
Isn't TI going to fix that some way?
Bye.
Mario G. Casali
System Electronics
Italy