Sorry for only just now getting back to you.
The Core file should have been updated. I'm not sure if the problem is still persisting for you after a redownload or not but it's fine on my end.
As for the solo rules, I finally got in touch with Peter (my fault, not his) and he gave me the all clear to add it to the bundle. I'm only adding it to the bundle on itch and not to the one over at drivethruRPG.
Sorry again, life is starting to mellow back out so I'll be around more.