Based on the picture it looks as though you have Coyote Forte DXi set to play as your default GM synth.

Regrading the "registration". that is just a matter of entering the Code in the Synth GUI. And the fact that it keeps asking for it, ya, I have had that issue. From my experience just when you think that will drive you nuts, it will stop. I never figured out why it did that, but it did stop after a while.

BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6