It is done by using the browsing option of mod manager, which allows user to pick file directly from the hard drive. You can install files from any source through the mod manager. If any site starts using their own extensions that would allow people to download files through manager and/or see updates after query, then MO2 might allow them to do so. They do not work for other sites, because NXM is Nexus link, so other sites and services are not using it. None of those functions cares where the mod came from.ĭownloads are handled through NXM-links.
Mod managers unpack archives and set files based on paths you have set for them.