The re-introduction of a MAC based software version is unlikely - see the page header here.
You could try using Parallels + Windows on the MAC however there is no guarantee that the software will work correctly.
Note while you may find a MAC version, 'used' or old stock, on the Internet, it will only work on an Intel based MAC and OS's v10.14 Mojave or earlier, Catalina and later OS's and any of the Apple silicon processors are not compatible.
@James-Linn Or get a cheap Windows laptop and an external USB audio interface. Sound Forge is not that resource intensive since effects are mostly applied in offline rendering.