Activating Davinci Resolve

Had to re-install Linux system but fortunately I had my backups so I could copy over davinci configs. It all starts without issue, but it is not activated (runs as demo mode).
I cannot find any way to enter my activation key!, what is the procedure for activating existing installation ?

you downloaded the free version
reload the studio:

https://www.blackmagicdesign.com/suppor ... and-fusion

There is no demo mode. If it doesn't ask for your activation key and the opening splash screen does not say Studio, you are running the free version. You can check which version using About Resolve. This is what I see with the Studio version when doing so.

ah damn! I was downloading from support page, must have clicked wrong link then! Thank you !