Cubase 6 & Cubase 6.5

I have been using cubase 6 for some time and decided to try the 6.5 trial ver.After the trial period,which i did not accept,I cannot use my old ver 6.0.
Do i have to re-install this version again?
I have use the e-licenser for re-activation and recover.No help

Anybody could help please to recover my DAW.
Thanks a million!

Not sure if demo is the same but I think that 6.5 generally overwrites v6…so probably you’ll need to roll back to 6 (using windows un-installer with show updates ticked) so the version you are trying to launch matches your license.

If that’s not it provide more details.