Just let the mod manager handle the installation.
Besides this just one change in the ini file has to be made.
You just have to do this ini change once. If you update the mod in the future then you will just have to update the files ;)

Open "C:Program FilesSteamSteamAppscommonfallout new vegasfallout_default.ini"
Go to line "92". In this line or close to this line should be written:
"bLoadFaceGenHeadEGTFiles=0" change the value from "0" to "1" and save the file.

Now you are all set and able to enjoy an almost bugfree Fallout New Vegas.
And if you still find an issue you know who you can ask. We will fix everything you report to us.