| Check | Status | |-------|--------| | Steam client running | ☐ | | Logged into Steam account | ☐ | | steam_appid.txt exists & correct | ☐ | | Game launched from Steam Library | ☐ | | steam_api.dll present & not blocked | ☐ | | Antivirus disabled temporarily | ☐ | | Game files verified | ☐ |