OSX: "Minecraft quit unexpectedly" on launcher startup

"Sorry, I meant this isn't a Launcher issue but more a macOS issue (Runs under 10.9 , crashes under 10.8) ?"

Really?

Of Couse is that a mc launcher bug...
Then before my Launcher automaticly updated the contens of today it was working fine.

Fair enough.

Same issue here. Some sort of compatibility problem between the updated Launcher and 10.8.5 in my opinion.

I have the same issue, however I use Mac OS X 10.11.6

Any infos?
Is there a way to downgrade the launcher, and play mc?

I'm in the same boat. Was able to play last night and now I can't. I have Mac 10.8.5.

Are you not supporting 10.8.5 anymore? Is there a way to revert?

I was successful with the legacy launcher, although the Minecraft game complains about using an old version of Java now: https://minecraft.net/en-us/download/alternative

Using the legacy launcher and playing for some hours now successfully. Still think devs should try to make it work with 10.8.5, though!

Exactly the same here, please come up with a solution. I mean, I thought forgetting my passwords, security questions, and deleting the email account was bad enough.

Same here. So, what can I do?

Same problem here.

I've been making due with the legacy launcher via bootstrap, but it's a bit of a pain and I'm worried that future mod loader versions might run into compatibility issues. My computer's too ancient for an OS update, so I'm hoping this bug gets found and squashed soon!

Same issue, the launcher crashes without fail every time I start up the game. I attached the crash log since I enabled that stuff on my macbook.

I have the same problem. How do I get/run the legacy launcher?

My bug was marked as a dupe of this one, but I'm not so sure.

5523 is about a crash when starting the launcher or when starting the game from the launcher.

I'm experiencing something different. (MCL-7881) For me, I have the launcher setup to stay open with the game and also open a debug window. The launcher doesn't crash until AFTER I quit the GAME.

It's not obvious to me that those are the same thing.

Also, I think the title of 5523 is a bit misleading. I realize it's what the OS says, but at first I thought my bug had been marked as a dupe of a game crash bug. And it's ambiguous. "On startup" of what? The game or the launcher itself? That's not actually the case with my report either.

Just like pretty much everyone else here, I have also experienced this problem since the day it started. It has been over HALF A YEAR! Give us a fix, Mojang! If you're going to discontinue support for the legacy launcher, then fix the one you want us all to use!

Still waiting. Legacy launcher doesn't even launch Minecraft anymore. Not cool! 👎

Legacy Launcher still launches MC for me. It wasn't working for me last month, but it sorted itself out.

Legacy launcher says:
Exception in thread "main" java.lang.UnsupportedClassVersionError: net/minecraft/client/main/Main : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

I can't start Minecraft for my son, and he is a real pain in the ... wo his favorite game. Please help me out 🙂

Monica, do "VOTE" on the ticket!

Peter, this thread is for the current Minecraft launcher, not the legacy launcher. Besides, I just double-checked, and my legacy launcher started up Minecraft without a problem. I don't know what's going on with it, but if you give it an hour or two, it should fix itself.

Laura M. I believe the comment by Peter is fair, given that he is responding to the fix offered up by the moderator note.

Has anyone else who is also having this problem found a fix that works?

The only thing I've figured is updating the Mac OS beyond Mountain Lion. Thing is, not only is the new Mac interface absolutely hideous, but mods become a thousand times harder to install. Plus, not every Mac can upgrade to anything beyond Mountain Lion, basically requiring people to buy a whole new computer just for one game. I wish Mojang would fix the launcher already. This problem has been present for almost a year and they're still in no hurry to patch it.

So no meaningful resolution to this problem, but mojang is now redirecting new reports of this error to other "resolved" threads that don't actually work. Well, looks like I'll be stuck playing 1.12 for the next four or five years as I can't replace a computer for just this game. Awesome.

Wow guys, do you know what day it is? It's February 7th, meaning it has been exactly one year since Mojang updated Minecraft's new launcher and shut all of us out! What's more, this issue has pretty much been mostly, if not entirely, ignored. I really miss the good old days when game companies actually cared about their players and bugs actually got fixed.

I recently updated to High-Sierra and there was also a new java update that has since fixed the issue for me personally. If you haven't tried that, I'd see how it goes.

I'm running Mac OS High Sierra, and I have never had a problem installing mods – if anything, it's easier. Just create a new game directory and do all your crap in there.