I use RDS 5.5 with OS 9.04, but you do indeed need the .01 patch which is specifically for OS 9 compatibility. Did you try going to MC's ftp site? ftp://ftp.metacreations.com/pub/Applications/ If you cannot get to it still, then email me and I can see about sending it to you. I don't know how legal that is but I'm fed up with MC actions regarding these products and years of loyal customers.