Regretevator itself has internal anti-exploit. Some floors will instantly kick you if they detect abnormal movement.
Open Roblox and join a server. Wait until the game has fully loaded and you are standing in the lobby or elevator. Injecting scripts during the loading screen can sometimes crash the client. regretevator script install
Before diving into installation, let's clarify what a "script" means in the Roblox context. Regretevator itself has internal anti-exploit