Brave no longer working with MacOS after update. Want to downgrade and preserve open tabs

I’m on Yosemite 10.10.5
Brave updated to – I think based on Version info at Contents/Frameworks/Brave Browser Framework.framework/Versions

I cannot launch it after the update with this OS and would like to preserve tabs i had opened before the update and subsequent issues.
Can I rollback the update and save this info? PLEASE?
Thanks v much.

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