This is from the changelog in the above-mentioned version 2.0.0 (modified from the previous version 1.6.3):
Changelog - [↑]
2.0.0 (October 04 2020):
No code changes. Sourceforge links corrected.
The old links [lwt.sf.net], [lwt.sourceforge.net] or [sourceforge.net/projects/lwt] are no longer valid!
The new links are now learning-with-texts.sourceforge.io (documentation and demo database) and sourceforge.net/projects/learning-with-texts (project home and downloads).
1.6.3 (April 06 2020):
Some missing confirmation dialogues (when deleting a single text, text tag, term, term tag, or language) added.
1.6.3 was the last official version, and if you have that then there seems to be little reason to 'upgrade' at present. Version 1.6.0 was dated 2016-01-28. I get the impression that someone is touting an 'upgrade' for their own reasons...
I would say that the GitLab/GitHub repos are absolutely fine unless someone can prove otherwise. Edit: I already had a copy of 1.6.3, but downloaded the installation instructions from GitLab and they were fine.