Hello,

sorry, I wrote .knxprod instead of .knxproj, my fault.

You have to convert an KNX5 (without licence) projekt into an KNX6 (with/without licence).
Then you can export a project to keep this as a backup.
The methods were given some posts above.

Furthermore:
there is no need anymore to create a special ico.link to start ETS (6.2.2) without any “nag”-screen.
You can choose an option inside of ETS during install.