Basically what the title says. Ever since the latest launcher update I haven't been able to play any version below 1.14 as they will crash when opened. Before the update it worked perfectly fine with no issues.
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Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please create a new ticket.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.
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You should check if you are using Java 8. If you don't, then change to 8.