How to 'revert to previous version'?

I tried updating Lightburn and after the file has loaded now have a choice of paying for the update, or reverting to my previous version.
However it looks like the update process has deleted my previous version, so I don’t have a choice?
How to revert please?

Your license expired Dec 19th, 2019, so you would be able to install and use any release up to 0.9.09.

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