@Martin_PL
Error: "warning: Unable to find file /maps/faf_coop_operation_rebel's_rest/faf_coop_operation_rebel's_rest_customfunctions.lua".
You need to correct the paths in the LUA files (open with Notepad):
FAF_Coop_Operation_Rebel's_Rest_CustomFunctions.lua
FAF_Coop_Operation_Rebel's_Rest_operation.lua
FAF_Coop_Operation_Rebel's_Rest_scenario.lua
FAF_Coop_Operation_Rebel's_Rest_script.lua
UEFaiP1.lua
UEFaiP2.lua
UEFaiP3.lua

Location of files: "C:\ProgramData\FAForever \user\My Games\Gas Powered Games\Supreme Commander Forged Alliance\maps\faf_coop_operation_rebel's_rest.v0001"
(for Windows)

Replace with :
/maps/FAF_Coop_Operation_Rebel's_Rest/
to :
/maps/FAF_Coop_Operation_Rebel's_Rest.v0001/

If you have any problems, here is a link to all the files.
"https://drive.google.com/file/d/15EkGASwmICCNKdNnt-xFCUV5XaYPw0RG/view?usp=sharing"
Just replace all files. And it should work