If you installed the beta program into its own program directory (choice 1 above) and you used a <a href="https://support.mozilla.org/en-US/kb/dedicated-profile-thunderbird-installation">dedicated profile per Thunderbird</a>, then start the release version of Thunderbird and it should use your release version profile data. If you no longer want to use the beta version, and do not need any of the beta data (address books, local folders, pop folders, etc), and wish to remove the beta data and beta program from your system:
Jeli sće betawersiju do jeje swójskeho programoweho zapisa zainstalował (hlejće móžnosć 1 horjeka) a sće <a href="https://support.mozilla.org/en-US/kb/dedicated-profile-thunderbird-installation">dedikowany profil na Thunderbird</a> wužiwał, startujće stabilnu wersiju Thunderbird a wona měła profilowe daty wašeje stabilneje wersije wužiwać. Jeli hižo nochceće betawersiju wužiwać a hižo daty betawersije njetrjebaće (adresniki, lokalne rjadowaki, POP-rjadowaki atd.) a chceće daty betawersije a betawersiju ze swojeho systema wotstronić: