Hey, Mossy. No bother. Add me and i'll try to help. I've not had any issues with 2019.4.9f1 at all. I'd need to know more about your setup to attempt to help.

Hi, sorry to be a bother... I also like making mods for house flipper myself, but I have loads of issues with the exporter.
The 2019 version has completely broken and refuses to work for me, I tried 2021.3.24 and that worked a few times, but it too has now completely broken and refuses to work. I've uninstalled it all, Hub included , and reinstalled many times... that used to work, but not anymore. Are you using a newer Editor version to export your models? Someone told me to turn off my anti virus software, but that didn't work. It's all so buggy! haha. Any tips would be greatly appreciated! :D