i m still in this rabbit hole with no working una 13 installation

i try to understand the dolphin cron job problem

but why dolphin

and i m really not the only user who has this problem, why we get no exact installation manual to go from una 12 to una 13?

what must i do with the cron job with my una?

why ist the cron job no problem in una 12 and a big problem in una 13?