I recently moved the FLSM server and didn't realize until a week later that there was a problem. The game was contacting the server to check for updates, but since the server was moved it messed things up. That's why turning off internet makes it work.
Anyway...
I released a fixed version that doesn't check the server anymore. I don't know how much traffic a free Mega account can handle, but I uploaded the latest version here:
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