A: Because it is an unsigned executable that modifies memory (speedrunners use debug tools). Unless you downloaded it from a verified archive source, assume the warning is legitimate and delete the file.
Since Steam automatically updates to the latest version, you must manually downgrade to access this specific build: Steam Console : You can use the Steam Console (accessible by typing steam://open/console in your browser) to download specific "depots." Manifest ID : To download build
A: Because it is an unsigned executable that modifies memory (speedrunners use debug tools). Unless you downloaded it from a verified archive source, assume the warning is legitimate and delete the file.
Since Steam automatically updates to the latest version, you must manually downgrade to access this specific build: Steam Console : You can use the Steam Console (accessible by typing steam://open/console in your browser) to download specific "depots." Manifest ID : To download build