Take the custom .upk file you downloaded and rename it exactly: Labs_Underpass_P.upk .
Ensure the map you are using is up to date and correctly renamed. Labs_Underpass_P.upk
Have you ever wanted to play custom Rocket League workshop maps but felt lost with the file management? The most effective way to play custom maps on PC is by utilizing the map as a base. Take the custom
It allows for storing assets inside your level package, essential for functioning with the Rocket League Workshop. Labs_Underpass_P.upk