How can I downgrade / beta version of Thunderbird back to the last working version?

I installed the beta version of TB by mistake (a while ago - I don't know how I did it.) Must have clicked on something without reading. I am now on v30.0). I need to restore or upgrade to the latest version of work. I use TB every day for work (associated NON-TI) and have a large number of emails that serve as customer history/records, so I can't afford to lose the info. I need to get off the beta version as soon as possible even if, as I am not qualified to use and require stability or a normal working version. Help, please!

First of all, given that you "cannot afford to lose" your emails, sure do you backups on a daily basis, reducing the risk of losing anything. If not, you really should before you proceed, see http://kb.mozillazine.org/Profile_backup , just in case.

Your settings and emails are in your profile, which is separate from the program files. You can reinstall without affecting the profile. (Which I am basically a copy of https://support.mozilla.org/en-US/questions/991859 )

If after that you have saved your profile, just install the latest version of Thunderbird https://www.mozilla.org/thunderbird/ or http://www.mozilla.org/thunderbird/all.html (all localized versions). That I remember we can ask you something as if you really want to install a new version.

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