0- If you want to play in french, download from swrebellion.net the french patch and extract it into your Star Wars Rebellion folder.
This will overwrite 28 files and add 1 file.
If you want to go back to english, do the same with the english-patch from swrebellion.net and overwrite these same file with original english ones.
1- Copy update-1.02-(220.127.116.11-fix) folder files into your Star Wars Rebellion folder.
This will overwrite 2 files and add 3 new files.
2- Optional: In your Star Wars Rebellion folder, right-click REBEXE.EXE
Change settings for all users
Uncheck all boxes
3- Create a shortcut on your desktop to REBEXE.EXE
4- Right-click the shortcut file you've just created
In Target, add a space then -w at the end: "C:\?????????\REBEXE.EXE" -w
5- If you have an Nvidia Card
Open Nvidia Control Panel (right click on desktop and click on Nvidia icon)
Check Enable Resolutions not exposed by the display
Add all resolutions
Adjust Desktop size and Position
Click on Scaling
Check Aspect ratio
Choose Perform scaling on : GPU
Check Override the scaling mode set by games and programs
6- If you have another GPU brand, do the same as above and get some more info here:
7- Start your REBEXE.EXE shortcut that now has the -w option
or run directly REBEXE-FULLSCREEN.cmd from your Star Wars Rebellion folder
8- To enable multiplayer over internet, normally GoG installer does the job.
If it doesn't, try to have those flows working both ways (windows firewall and internet box) :