The game Spore’s steam release’s steam_api.dll is registering as a modified steam_api.dll for both the main executable and the Galactic Adventures executable, resulting in the UI not allowing me to Accept the terms and conditions.
Disable Steam enhancements - https://www.pcgamingwiki.com/wiki/Special_K#Disable_all_enhancements
This issue can occur in older games that uses some of the earlier versions of Steamworks due to a lack of functionality in those versions.
Sorry to hear, are the instructions for disabling SteamAPI features at least clear? That’s really the entire reason that nag screen exists, I am not checking for piracy per-se.