Unfortunately I don't have the linux version so it is difficult for me to find the issue. What error do you get? About 2 months ago someone was having issues similar to this (with linux) and changed the folder name to SFCRevamp (from SfCRevamp). I have no idea why that worked, but you might want to try it.
Viewing post in Mod: SFCRevamp
It is in equipment.gd and item.gd from revamp equipment and revamp item respectively for every icon far as I can tell
for example starting at line 19 of equipment.gd
#weapons
dagger = {
icon = input_handler.loadimage("user://mods/SFCRevamp/revamp_equipment/icons/Dagger.png"),
},
It is also SFCRevamp in all of the
icons\(item/equipment name).png.import
files for the two submods