You'll need to download SLADE (or another WAD/PK3 editor) and open the PK3 with it.
Inside you'll find a directory SOC in which these files are stored.
All you need to do then is fix the bugs I described and then save it and it should work. If you need help with that either check the
SOC documentation or if that doesn't help feel free to send me a message.
(On a side note if the authors of this addon want to update this I have a fixed version already on hand)