Maybe I missed someting. But if any other person looks:
I made a first install of Bandlab CW last weekend (May 2018).
I installed almost all modules except melodyne.
Summarize: Nearly all components allowed to choose installation path. Except Studio Instruments.... Hope this will also be made customizable soon. Also the TH3 for cakewalk was on c:
So if anyone is interested, it now works (maybe I overlooked this somewhere else, but I think it is usefull to append this info in this thread.
cheers & thank you Bandlab