I would guess that you deliver the DLC support from the same Nexus page so it sees it as a different 'version' of something that's already installed and wants to update it. The last time I used NMM it used the metadata (specifically the mod name, Nexus page location and version number) to attempt to determine if it was an update to an already installed mod or not. I really should repackage it as a full 1.23 release with everything. WTF is NMM doing to my fucking mod? It's not like Fellout is an obscure edge case doing weird shit.
