You can use a tool like to force the PC to forget a game is already running. Open Process Explorer as an administrator.
A specialized tool that encrypts account data and uses "multiroll" to launch numerous instances. 2. Manual "Singleton" Bypass Multi Roblox Instance
These are modified launchers that include an option for "allow multi-instance launching" . You can use a tool like to force
Third-party launchers are the most common way to bypass the one-instance limit. Multi Roblox Instance