The JEDI-SDL installers now come in 3 flavours :
FULL - http://jedi-sdl.pascalgamedevelopment.com/files/JEDI-SDLFullSetup.exe and it's about a 4.5MB download.
HEADERS ONLY - http://jedi-sdl.pascalgamedevelopment.com/files/JEDI-SDLHeadersSetup.exe and it only about 1MB.
DEMOS ONLY - http://jedi-sdl.pascalgamedevelopment.com/files/JEDI-SDLDemosSetup.exe and it only about 2MB.
It should install the files to the specified directory, but should also update your particular version of Delphi's Libaray path automagically. It should also update FreePascal's fpc.cfg if you used the FreePascal installer in the first place.
So it's not the official v1.0 release, but I am getting ever closer.
Please give it a test and let me know if there are any problems.