Never download or run .exe or .msi files claiming to be PS3 games. Game files are strictly .pkg , .iso , or folders containing .bin and .dat assets.
Do you need help setting up to access online levels? Little Big Planet 3 PS3 - PKG -ISO - Download
Run a tool like PSNPatch or let modern PS3HEN/CFW automatically activate the RAP file from the exdata folder upon launching the game. How to Launch Little Big Planet 3 ISO Files Never download or run
Scan for new games, select Little Big Planet 3 , and "mount" it. select Little Big Planet 3