I have re-downloaded the launcher and re-installed the game on my pc, but I still can't play the game at all, as well as not being able to find the twitch broadcaster. Either when I start the game or when I join a server/single-player world, the game freezes on downloading terrain and then crashes, or sometimes just stays unresponsive without crashing. I don't know whether the crashing is as a result of the game not being able to locate the Twitch libraries or not, which is why I am reporting both instances in a single bug report.
The game cannot find the Twitch libraries because Twitch integration has been removed and is no longer supported.
Also, your Minecraft version is outdated. We currently take issues for version 1.12.2 or the latest snapshot.
Please update to the latest version as it includes the newest fixes. If you still have this problem after updating, then please create a new issue.
In case of a game crash, please also attach the crashlog.
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