Refused worlds

Since client 0.3.0

Before using any file of a world, your game checks it against the world's manifest, its list of files with their size and SHA-256: a file damaged on its server or on the way does not load. A world's scripts always run in the game's FL# sandbox, whoever made the world.

What the loading screen says

MessageWhat it means
This world must be republished by its creator.The world was published with an older NodeWorld SDK. Only its creator can fix it.
This place needs another version of NodeWorld. Update NodeWorld.The world or its server is newer than your game: update NodeWorld.
This world’s files are damaged on its server.A file of the world does not match its manifest. Tell the server's host: they copy the world's folder again.