Mac OSX ver 10.15, aka "Catalina" allows the installation of 64 bit apps only. SF for Mac is a 32 bit app so cannot be installed or run. Apparently, a number of software manufacturers have been adversely affected by thi change made by Apple.
This is what they replied (4/23/2020) to my support request regarding Sound Forge Pro Mac and Catalina.
"Greetings from Sound Forge Support, Thank you for contacting us. Unfortunately, at this time there is no clear answer to what the future of Sound Forge Pro Mac will be. There are no plans in the foreseeable future to update the program to be compatible with Catalina, and it is hard to say whether or not the Mac line will continue at all. I apologize for the inconvenience of this and we thank you for your time and understanding."
I have been using SF since 1995 (Sonic Foundry) on Windows. I thought Magix was going to keep going forward with the Mac version making it as good as the Windows one but I guest I was wrong.