enabledModNameCount has to permanently be at 1. You have to change it manually in the .txt file, before starting the game.
Changed the enabledModNameCount to 1 and saved it. Started the game and a Window appeard on the top left of my screen with the this on it:
Text FileArchive missing Label.
File: C:\Users\Matteo\Documents\My Games\Ironclad Games\Sins of a Solar Empire Rebellion\Mods-Rebellion v1.85\EnabledMods.txt
Line Contents:enabledModNameCount 1
I click on Break and it takes me to the game (not the mod). I then go on options and activate the mod and then apply. The same failed to convert " to an enum value appears on a Window on the top left corner.