You should try deactivating Sound Forge on the PC you are using through the Magix Service Center. Then re-activate SF on the PC. This has been known to resolve the recurring error code 59 issue. See this comment for instructions.. https://www.magix.info/us/forum/activation--1304816/#ca1804432 When you reactivate, be sure to use the same email address that was used when you initially registered and activated SF-15. Your SF-15 activation serial code and the email address are paired.
If this does not work, you may have to contact Magix Customer Service Email: infoservice@magix.net
btw, welcome to the Magix Sound Forge users community @andrew-whittaker
Hi Rraud thanks for the suggestion, sadly, no change, I'm still forced to activate and register every time I open the program. I've email them direct !