I was able to get to install Joomla 4 with the JA Focus template.
However, there are three problems that I couldn’t manage to solve:

In BackFrom -> Content -> Articles. In the list of the Title column, it indicates that the category is “Trashed”, this is wrong. If I access to this list from Categories and then I click any number of the “check” column, the list appears to be correct, but if I update or modify the filters the page again says that the category is “Trashed”. What I found out was that the field “published” of the category is empty (you can see that in the line 302 of the file default.php in administrator/com_content/tmpl/default.php).
In a personalized template of Focus that I made it works out perfectly (http://rvy.conb.net/es/enoturismo-oleoturismo/almazara-deortegas-oleoturismo/catas-de-aceites-de-oliva-virgen-extra), except that it shows up “Expired” beneath the title. I know it’s easy to delete this line in PHP, but I thought that it would be somewhat like the previous one.
Global Configuration gives me an error: “The asset for global configuration could not be found. Permissions have not been saved.” The strange thing about this is that it gives me the same error in the local environment with Windows 11 and Laragon as the web server, and in my VPS rvy.conb.net.
The first problem might be caused by an error in SQL, Joomla Core or T3 Plugin. Regarding the second one, I’m suspicious of the NULL values in the date fields of the tables.
With the third one I tried checking asignations, users, etc. but I don’t understand the problem. I freshly-installed a new version of Joomla and tried out other solutions, but
Thank you. If you need the access to the Back-Front, tell me and I’ll send you the keys.