Black Screen League Client and Stuck Updating Bug

Making a thread since there seems to be a possibility that there's a bug only affecting fresh installs or something similar where those encountering it haven't made a PBE account yet. If you're encountering an issue where the League Client is showing a black screen with a stuck update bar like the image, please share either here or in the [Reddit post]( if you don't have a PBE account yet, if you are updating an existing PBE client or if this is a fresh install, and if you have already played on the PBE on your machine or if you're installing PBE to that machine for the first time. Thanks!
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