Thank you so much!
It was what I thought with the Uppercase issue.
I made the change on the file /etc/yum.repos.d/CentOS-Linux-PowerTools.repo and ran the script again and it started to install.
Dear community,
I have installed a fresh centos8 in server without GUI and when I run the script to install Plesk:
sh <(curl https://autoinstall.plesk.com/one-click-installer || wget -O - https://autoinstall.plesk.com/one-click-installer)
The process stops and I am getting an error message...