Have you tried to access apache mainpage (it should be accesible with your IP only written in web browser)?
Is it an windows or Linux server?
I did only installations on linux and if instalation script run Ok, and all dependecies were installed before, there was no problem. I also use Apache2 and MariaDB but php is 7.3.
I just Installed 2.9 server on Debian Buster and I'll make actual "Instalation Tutorial" in a few days so I can notify You when it will be ready.