amipal: no but you dont need an installer.
just unpack the os4 archive and insert the quake 2 cdrom and copy the the baseq2 dir with pak files (and the files inside the dirs) into the baseq2 dir your os4 quake2 archive had.
basically the dir structure will end up like this:
Quake2:
Wizard , ahi.dll (etc)
Baseq2 (dir)
Pak0
Pak1
etc.
just make sure you dont over write the files on the cd with the files in the os4 archive , as ofcourse you will need the files from the os4 archive :-)
basic stuff and its a tad slower than extracted but with sfs and a dma card you wont notice any big changes.
(slow as in disk speed while loading maps etc, not ingame playing slow downs)
cheers