Welcome msumpsi to SubSim!
I just tried downloading the MaxOptics IV for RFB 2.0 and had no trouble with it. Yes, the download link takes you to the GameFront site where the mod is kept. The reason it's not directly on the SubSim server is due to SubSim's limitation of a mod being no larger than about 40Mb in size. MaxOptics IV for RFB 2.0 is about 66Mb in size. Believe me, I'd be happy to have it off the GameFront server and kept here, but that's not going to happen unless there's a change in what we can upload.
As far as a SCAF for RFB 2.0??? I don't have one. Maybe you're referring to the SCAF for TMO 2.0? It's the same issue as the above mod. Too large for the SubSim server.
Not that it makes much difference, but SubSim
does offer a larger server using the FTP protocol. I have a couple of very large mods uploaded there (both about 250Mb each). The problem here is that there is a limit on how much the FTP server will allow for one account. With the two mods, there isn't enough room for any more. I can't get a response from management regarding getting more space, so I'm left with putting mods onto GameFront, like it or not.