@Rennie-Gold This happens if you want to run Sound Forge under Mac OS Catalina, Big Sur and Monterey. Sound Forge doesn't work with these operating systems.
As the linked post which @PATIENT-X pointed you to says, it is not possible to run SF Mac under any recent version of MAC OS, because those versions of the operating system require ALL apps to be 64 bit. There is no way by which you may run SF because it is 32 bit, sorry.
The only solution for you is to downgrade your OS to a version older than Catalina.