As mentionned in that thread, there is a Zotero 7 branch. I have installed it following these instructions:
As a quick work around, you can just zip everything in the addon/ folder and name it zutilo.xpi. The make machinery is mainly used for converting the README files from markdown to html and including them in the xpi file, but for testing you can just ignore the README file.
This is working quite well for me, recovering some of the functionalities of Zutilo. But as mentioned by the developper, it is still some work in progress.
Upgrade Storage
https://github.com/wshanks/Zutilo/issues/248
I have installed it following these instructions: https://github.com/wshanks/Zutilo/blob/master/docs/DEVELOPERS.md
This is working quite well for me, recovering some of the functionalities of Zutilo.
But as mentioned by the developper, it is still some work in progress.