Ok I did now the following:
Moved the app directory to the C: drive.
Deinstalled PS CC 2015 and LR 5.7.1 from D: drive
Wanted to reinstall both apps on the C: drive - Adobe CC tells me that i can install PS CC and LR 5.7.1 (not the CC version / LR6)
i am confused now as I have paid the CC package for Photographers...