So I downloaded Spiral Knights, opened it when it was done, then the Spiral Knights window popped up as usual; patching something.
But whenever it reaches about 65% (where it usually pauses the longest in my other PC), it closes by itself.
I clicked Play again but it said that it "Failed to start game (app already running)" even though Spiral Knights is nowhere to be seen.

It's already about the 3rd time that I close Java through the Task Manager just to delete Spiral Knights from my local drive, then redownload it and start it again, just for it to happen again.
I've tried restarting my computer, closing other running programs and it still happens.

Any solutions? Thanks in advance