Works for me. If you are trying to download it in Firefox, you have to do a right-click Save As on the Download link to save the .xpi file. Otherwise Firefox thinks it is a Firefox addon (also .xpi files) and tries to open it, but can't. After downloading you then need to add the .xpi file to Zotero ... https://zotfile.com/#how-to-install--set-up-zotfile (note that some of the documentation at that site is out of date, eg extract PDF annotations, which is now done by Zotero).
Thank you for your reply. I tried to download the link as a file (both in Safari and Firefox) but I keep being redirect to an error that says the server address cannot be found. The same also happens on my Windows computer. Older releases give me the same error.
Upgrade Storage
https://zotfile.com/#how-to-install--set-up-zotfile
(note that some of the documentation at that site is out of date, eg extract PDF annotations, which is now done by Zotero).
You can also do the same at Zotfile's github site.
https://github.com/jlegewie/zotfile/releases
https://github.com/jlegewie/zotfile/releases/download/v5.1.2/zotfile-5.1.2-fx.xpi
Are you able to download anything at all from github ?