Error code -59 "You do not have the license to use this software"
Confirm you are using the correct activation code Magix gave you for the version you purchased along with the email address you used when you initially registered and activated Sound Forge. The activation code and your email address are paired, so both must be correct.
If you purchased Sound Forge from a third-party seller, you may have a voucher code instead of an activation code.
Welcome to the Magix Sound Forge users community @Albert-Lucero.
I've been using my licensed SOUND FORGE Audio Studio 15 (x64) for years and love it... The only thing that happened prior to the problem is I connected a Arturia Minifuse 2 USB audio interface and a Arturia Minilab USB controller.. Everything is working including my Acid Pro 10 Suite, Cakewalk by Bandlab and tons of plugins but not my SOUND FORGE Audio Studio 15 (x64)... I'm thinking but don't want to try it yet is to uninstall and then reinstall SOUND FORGE Audio Studio 15 (x64)...
Try deactivating and reactivating. You can do this at the 'Magix Servce Center> My Products' or within the Sound Forge 'Help' menu. Either way, your must have an internet connection,
Another option to try: reset and clear the cache as well, This would reset your preferences and such to the factory default settings. The "Reset and clear cached data" command is in the 'File' menu.
A reinstall should not lose your preferences, but it may not fix the issue w/o a full uninstall and clearing leftover data and reinstall. If a full uninstall is wanted, I usually recommend 'Revo Uninstall' for the task.