how do you get a crash log

This site is to report bug reports, not ask questions.

You can force a crash report by holding F3 + C and find the report in .minecraft folder

it didnt work

You said in your other report that the game instantly crashes. Does the launcher not show a crash log?

it just says the game has crashed an unexpected issue occurred and the game crashed. Were sorry for the inconvenience exit code 0

I'm afraid we can't help with that then, this is technical support. Please contact community support, they might be able to help you with that.

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