BLAM! Error: "The Aftermath Reboot requires FSO which is missing."
I click Play on the Retail FS2 and Error: "No executable was found for this mod." I copied the FS2 executables from my FS2 root folder into the "FS2" in the Knossos library folder (I found that there are FS2 VPs in there). Still I get the same error: no executable.
Ok, I am guessing that my Knossos does not know where my FS2 game is. There is no manual setting or option to set my FS2 game root folder. Knossos doesn't have that option.
That's because the FSO builds are stored differently from the mods.
In the folder you have designated as your Knossos Libary, there should be at least 3 subdirectories: "bin", "FS2" and "temp" (as well additional folders for any Total Conversion, if you happen to have them)
"FS2" should contain all mods and a copy of your FS2 install (which the Knossos installer will create by copying an existing installation).
"bin" should contain folder for your FSO builds, with subfolders names like "FSO-22.0.0" (for the 22.0.0 release build) or "FSO-21.3.0-20210916" (for the nightly build with that check list).
Each build subfolder is set up like a knossos mod in of itself - including its own mod.json. But instead of a folders for "data" or "package" you will have one named for your OS (e.g "windows"). That folder will have further subfolders for type of builds (x64, x64_avx, x86, x86_avx) which then contain all the files that relate to that build download - from the .exes to all manner of .dlls.