Tesseract vs Tyler Tesseract and no updates

I’m seeing two author for this theme and my client has one of each installed on seperate sites. I’m trying to figure out which one is better supported, but seeing issues in terms of no being able to get updates for both.

https://tesseracttheme.com/
https://themesinfo.com/tesseract-master_branch-theme-wordpress-rx

Further some sites have a prompt to update the Tesseract theme while other do not. In creating copies of these site, I see this difference in showing or now showing a prompt to upgrade across sites, on the same server with the same software and same version (carbon copy sites).

So between these differences in prompts for updates and inability download and update manually, I’m wondering if there’s no reliable way to keep Tesseract up to date no matter which author theme is installed.

Anyone has any further insights?

Thanks`