Hi [@Ken],
For TwistedBrush Pro Studio versions 23 and 24 you don’t need to enter a user name, just the license key. We can assure you that the key does work. You can enter the key from the menu File -> Enter License Key.
Your key will work no matter if you have downloaded the program from Sharewareonsale or from our website. The installation file is the same. Just make sure that you have downloaded and installed the right product version – 23.06. This can be checked from the menu File -> About.
Regards,
Pixarra Support