Go to https://releases.wildfiregames.com/rc/ and download the RC0 for your system (Windows: win64 ; macOS: aarch if M1, x86_64 if Intel ; or Linux: AppImage). Install and play
Just check the link https://releases.wildfiregames.com/rc/ , download for your os, now linux have a appimage so you don't need to do anything fancy.
RIP you, market got fixed, you'll need to find another exploit.
If you're exporting it the right way blender will tell you that you exported 2 objects, so prop points are counted there. Other than that, no idea, sry. Maybe you'll find something in here: https://wildfiregames.com/forum/topic/19739-prop-points-guide-and-faq/