I have looked at my files, and everything is dated 11-25-19. I have added nothing to the standard download for SDRUno dated 11-25-19.
One thing you might try is to go to your SDRUno subdirectory and start rsp_tcp.exe before you run DSDPLUS. I always have it running. If it has shut down, I can not use the RSP with MultiPSK. Maybe that is true here.