I didn't use the installer program, as we now have two DC versions.
If you wanna play in DC-Final, install to that directory
eg: C:\Program Files\EA GAMES\Battlefield 1942\Mods\DC_Final\Archives\BF1942\levels

If you wanna play in Desert Combat (whatever version), install into that directory
eg: C:\Program Files\EA GAMES\Battlefield 1942\Mods\DesertCombat\Archives\bf1942\Levels

If you want both.....go for it!!!

I will have my server on almost everyday.
search the server list for  9tHgATE
or for the actual game      Brid Airport


any feedback:
zorg_traveller@yahoo.com
http://zorgtraveller.co.uk