Is there a way to register my copy of Visionaire permanently?

I have a technical question - is there a way to register my copy of this program permanently?

Each time I turn on the program, I have to register it again, after closing the Visionaire and re-opening, it is unregistered again

Once you input your license it should update the ini file with the name you used to register it & the registration key. It's tied to the ini file so you shouldn't have to keep re-entering it each time.

The only thing I can suggest you do, is uninstall & redownload the installer from the licenses page. You will have to input your name & license key & it will let you download the full version - I've not used the evaluation version so I suppose it could be possible that it doesn't actually update the ini file.