I cant open Twitch Launcher modpacks...

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Please do not mark unreleased versions as affected.
You don't have access to them yet.

yep, same nothing happens when i click "view crash report" but i went to the minecraft folder (Windows C:\Users*Your Username*\AppData\Roaming\.minecraft\logs) there you can click "latest.log" and you'll see the latest log as the name says xD