After cloning repo, opening in Unity 2021 has me enter safe mode?

After cloning https://github.com/icosa-foundation/open-brush and attempting to open the repo in the recommended Unity 2021.3.9f1 (and what the repo indicates, Unity 2021.3.16) as well as downloading Python 3, I am forced to enter safe mode with the following list of errors:

How can I open the project in Unity / resolve these errors?
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GitHub
Open Brush is the open source, community led evolution of Tilt Brush! Forked from https://github.com/googlevr/tilt-brush - GitHub - icosa-foundation/open-brush: Open Brush is the open source, commu...
GitHub - icosa-foundation/open-brush: Open Brush is the open source...
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