I have v2.1 the serial version on cd & 2.5 (full) on floppy. I ended up getting 2.5 from antigravity before they went under. I have the full userguide for 2.5
the userguide on 2.1 is on the cd. Both versions are RTG (the serial version is just very slow because you are sending all the graphic info over the serial port)
Both version do no use the video switcher hardware.
I don't remember where I got 2.1 from I did a search on google & went to every link that still sold amiga software.