I was having problems with the previous Thunderbird version, 91.2.0, so I started using the beta. When 91.2.1 was released I uninstalled the beta and installed 91.2.1. When I tried to load Thunderbird I got a message that I needed to create a new profile. I uninstalled 91.2.1 and tried to go back to the beta so I could check the settings and do a smooth migration, but I got the same message saying I need to create a new profile. I then uninstalled the beta and went back to 91.2.1, and tried to create a new profile but I'm stuck. Attempting to create a new profile didn’t fix anything, I’m still locked out and there is no option to access my old profile. I also don't know what the old settings were since I haven't had to look at them or change them in years. I have been reading through the support files, but all they do is describe the issue I’m having without offering an actual fix. One of the articles titled, “Dedicated profile per Thunderbird installation” at https://support.mozilla.org/en-US/kb/dedicated-profile-thunderbird-installation says, “Downgrade protection can be overridden by launching Thunderbird through the command line with the --allow-downgrade parameter.” But when I click the link it says, “Page not found” https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options I only use Thunderbird for newsgroups. How can I load the new version of Thunderbird and access my previous settings or transfer them to a new install?