Simple Installation Instructions for Sol: A History.
I'm working through this campaign now. Here is how I got it to work. yes, it's pretty simple. No, you're not going to like it.
1. Do a full retail installation of FS2. This means from the CD's. Install to the default installation directory (which is, iirc, c:\games\freespace2)
2. Launch it once to do setup for your video rendering, blah blah.
3. exit the program.
4. Go get Sol: A History from Blaise's website. Zipfile. Save the Zipfile to your Freespace installation directory.
5. Go get the Inferno Core and Inferno EA Ships files from Inferno. These are self-extracting executables. Put the VP files into your Freespace installation directory.
6. Unzip the Sol:A History zipfile into your Freespace Installation directory. It contains a folder called 'data' which will replace/update the existing 'data' directory. This is easiest to do by choosing 'extract here' when unzipping it.
7. Launch Freespace 2.
Okay, yes, it's a bummer that SAH doesn't run on the SCP (unless someone has fixed this) but who is complaining? The campaign is absolutely stunning and will keep you busy for a long time. 40 missions over 4 time periods. I also believe (but don't quote me on it) that SAH is connected to several other campaigns including Inferno, Derelict, Homesick, and Blackwater Operations.