As far as I know CONE/Cecil who made HexKit has been out of contact for over a year or more now, no one knows what happened to them. If HexKit gives you issues, I'd still recommend Tiled, which is free on itch as well.
He had his ttrpg book that was supposed to go to print too. I still keep an eye out for him just in case. I'll ask Better Legends/Skullboi next time I visit his stream if he's heard anything
