same problem as others
Comments 2
We do not have enough information to find the cause of this issue.
Please attach the crash report found in [minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder] here.
If you cannot find a crash report, please attach the full launcher log found in [minecraft/launcher_log.txt|http://hopper.minecraft.net/help/guides/minecraft-logs/].
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looks like they have fixed it by giving out another update just click the icon and it will update again and it will let you use optifine