How do I downgrade to v31.1?

Is there a download archive somewhere for old versions?
Is it as simple as downloading and installing the older version over the newer one?
Obviously I want to keep my setup, etc…

Thanks.

Hi saibot,
User profile issues have been reported when downgrading, it may or may not work.
I would backup important items like bookmarks etc.
Tip: Export your ‘Bookmarks’ to a HTML file for safe keeping.

Older versions can be found in the external link below.
Comodo Dragon-Filehippo

You could keep the installed version as is until an update is released to fix the Flash issue (Presuming that is why you want to downgrade) and use the older version as a portable.
Portable Version

Kind regards.