On larger files FOMM might freeze or act unresponsive for a bit. Installing a mod from an Archive with FOMM
The mod may or may not open a custom installer which should have instructions on how to configure the mod to your liking. FOMOD file in its directory, go to package manager in FOMM and click the mods name on the list and the click activate. Once FOMM is installed all you have to do to install a.