The "One or more plugins could not find the correct version of the master file....etc." message means that the plugin was created with an earlier version of Morrowind than the one you are using. If you have Wrye Mash then on the Mods tab the checkbox for this mod will be Yellow. Select it and then look for the Save button in the bottom right. Click that and the mod file will be updated and the error removed.
Thank you SO MUCH!!!!
This was driving me crazy.
I really appreciate how helpful you are, here in the Morrowind area of the Nexus.