Please email supportdos@larian.com, with a zipped save.
Each save is a folder in the '..\Documents\Larian Studios\Divinity Original Sin\PlayerProfiles\<ProfileName>\Savegames' folder. In Windows Explorer you can zip a file or folder by right clicking on it/them and selecting 'Send To | Compressed (zipped) Folder'.

Alternately, you can send 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 file size, you can delete most of the saves from the zip.