Go to the Roblox Create page, filter by "Games," then use the advanced options to select "Copy Locked: No." You will find hundreds of open-source example games.
If you download an uncopylocked version of a game like those created by Qserf, you are likely looking for one of three things: qserf uncopylocked
Instead, use the official Roblox Library: Go to the Roblox Create page, filter by