Update files
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Plugin only. Install after main file, overwriting when asked (select Merge in Mod Organizer 2).
Some USSEP changes forwarded, but it is still not a hard 'requirement'.
Optional files
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Restores Cicero's dances. No plugin required.
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http://3dnpc.com/2017/11/20/3dnpc-v3-4-for-oldrim-and-sse/
Untested with the latest version of 3DNPC. Please report any problems.