Need to download Remote Desktop v3.9.3 help!!

The only supported Microsoft Remote Desktop Application (RDP) on macOS Catalina or later is currently the v10.5.2 release in the Mac App Store. Due to the low comparative version number of your request, it is likely a 32-bit application that is not supported on Catalina or Big Sur.

The Question is Apple Remote Desktop 3.9.3, not everyone can move to Mac OS11 so how do we get 3.9.3 since only the Big Sur version (3.9.4) is on the App Store

Windows RDP is a different app.

You are welcome.