Immersive Armors is heavily compressed in the archive and you may not have sufficient ram/paging file or disk space to process the extraction. Just do it manually since the contents of the archive contains a plugin & a beth archive -> just move the .bsa and .esp/.esm to your Skyrim/Data directory & activate the mod in your load order.
I've never used the nmm. I've always done manual installation since the days of old (or since I got into mods) manual installation & uninstallation is the most powerful method for troubleshooting mods.
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try manually:downlad and place stuff into data,and play