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My computer is 64 bit and I have a 64 bit for Technic but when I try to run it as 64 bit it launches then shuts down after. I go to 32 bit and run Technic and it works, but when the game is running it says I've run out of memory.

When I click play on Tekkit Legends it runs on the bottom but when it finishes it closes the launcher then opens it back up.