OFFICIAL PAGE: RipX DeepRemix
RipX DeepRemix, from Hit 'n' Mix, is an inexpensive AI-powered application which can separate a mono or stereo source file into stems, making it useful for upmixing mono source material to stereo. The separated stems can easily be exported to your DAW. RipX DeepRemix is available for both macOS and Windows and a trial version is available.
Screenshots courtesy of Hit 'n' Mix