I'm not sure what else to try. You can email supportdos@larian.com, with a description of the problem and the report.zip file generated by the
D:OS support tool (for the PC version). The report will contain system and game information, as well as your saved games. To reduce the files size, you can delete all but one save from the zip (by the poison spot where this consistent).
Check the '..\Divinity - Original Sin\Shipping' folder for any CrashDump files, and if any were created either add them to the report.zip, or zip them separately.