Enhancement: automate downgrade process

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Enhancement: add auto downgrade process or warn installer about downgrading before installing a previous version.

I had v2.1.44 installed and have not had any installation issues with any previous upgrades.

I (?successfully?) installed v2.1.47, but afterward anki v2.1.47 would not load due to a numbers critical load errors which v2.1.44 did not have.
I tried reinstalling v2.1.44, but the v2.1.44 installation failed b/c of additional critical issues including not running some kind of downgrade process.

I completely removed anki then successfully installed v2.1.47 w/o any issues.

Just FYI, Tracey