Many Fmodpro mods require a "key" to activate the menu. This often involves clicking through several pages or watching ads to unlock the final "Fmodpro link".
Navigating to an Fmodpro link usually involves a multi-step process designed to verify the user or generate ad revenue for the modders:
Games with online components often detect these mods, leading to permanent account bans.
Users find specific game versions on the Fmodpro homepage or via YouTube tutorials.