The mod compatability addon for 1.20 is available:
download mod compatibility addon for Neutral Pack 1.20
This addon will make the Neutral pack work under any SEV mod, if that mod has a working default AI. The addon however does not support custom speech files, if you want to play a game of standard SEV or a game with Fyron's quadrant mod (FQM) or unnamed's AI mod, you will not need this patch, and you're better of using just the neutral pack itself.
Installation:
This is not a stand alone mod, you will need the neutral pack itself for this patch to work, so first make sure that you have downloaded and extracted the neutral pack itself into the \empires directory of your space empires V folder. (this is important)
If so, you can extract the mod compatability addon into the empires directory of the mod that you want to play, everything should work fine now.