When you have VERIM 4 activation key you can use it with VERIM 3 and 4.
The version Personal / ProNet depends only on the activation key.
The download is the same.
Size: ca 1GB
If you want to update your VERIM 4, just download the newest version and install it in the same directory as VERIM 4.
It will overwrite the version on the computer, without need to de-activate and activate the software again.
All settings remain.