Again, after many years i am trying Joomlart T4 framework and find that the lagging may still exists. I tried the latest download and the install failed with Joomla 4.2.6.
Please test it out for yourself and confirm.
I'm not entirely sure of the issue here, I just tried to download & install each package from here: https://www.joomlart.com/member/downloads/joomlart/t4/t4-framework
in Joomla 4.2.6 but it works fine.
Could you clarify the issue in more details?