Direwolf20 1.10.2 v1.5.1

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Did you edit pack?

Did it break after you updated pack? How did you update pack?

What launcher are you using?
 
As I mentioned in that "form" when making this thread I did not edit pack.
It breaks after upgrading from 1.4.1 to 1.5.1 by clicking versions and continue. How else?
Curse launcher version 7.1.6246.42969 beta with Jar Launch method.
Reinstalling, not downgrading, to version 1.4.1 seems to fix the problem.