The installation process should take about 10-20 minutes if you run the below command
sudo su
bash <( curl -k https://openlitepanel.com/repo/install.sh)
Enter License Key - < PAID PRODUCT KEY > OR < 1234567890 > - FOR FREE EDITION
Thats it !!
Please make sure you have opened following port :
TCP: 8090 for phpMyadmin
TCP ( http): 80, TCP (https): 443 and UDP: 443 for webserver
TCP: 21 and TCP: 49152-65534 ( optional ) for FTP