TM1 Forum

As I did not find anything about that issue, I want to ask about migration from 32 to 64 bit environment.
Can I just copy and paste the folder with my whole model and data from 32 to 64, or it is not that simple?

More or less.
Install the 64 bit version, copy the server directory over, restart. You may find you need a new license key, though IBM have stepped away from using these for monitoring, without, sadly, providing a usable alternative.