My TB-portable is on 60.9.1 the latest downloadable version on this site. The updater reminds me since about some weeks. Latest version out is 68.5.0. When will TB-portable will be updated to this an be available as download here?
New: Kanri (Oct 09, 2024), Platform 29.5.3 (Jun 27, 2024)
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There is an issue with Thunderbird 68+ that prevents us from making it fully portable, so until we get the problem figured out 60.9.1 is our most up-to-date release.
If you want more information on the issue you can check the bug thread.