Legacy jars will crash instantly on a Mac if they attempt to boot with a modern Java runtime. In the instance settings, go to the tab. Check the box to Override Java path .
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It is a collision between Mojang’s legacy download code and Apple’s ever-tightening security model. For the casual player, the permission reset (Fix 1) or cache wipe (Fix 2) will restore normal play in under two minutes. Legacy jars will crash instantly on a Mac