@Stephen-Wilkinson4993 SoundForge for MAC doesn't work on Big Sur and there is no update planned that it ever will. Therefore ask infoservice@magix.net for a refund or a Windows version.
. . . . They do not have any information saying that it will not run on this OS. . . . .
The discussion over what specifications do and don't say about what a program needs to run has been discussed several times in the various Magix forums.
In a nutshell the specifications tell you what the software does run on, there is no legal or other mandatory requirement to say it does not run on x version of an OS.
In the case of Sound Forge for MAC this is the case - the listed versions of the OS states Meaverick through to Mojave - it does not mention Catalina or BigSur.