Put the summary of the bug you're having here
What I expected to happen was...:
play normally after the new launcher's update
What actually happened was...:
everytime I join any server it like kicks me for bad compressed data format
Steps to Reproduce:
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-2968. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.