OK, instead of using an Raspberry Pi device and flashing the Raspbian OS image every time, I went ahead and installed the Debian with Raspberry Pi Desktop OS on my PC, and am getting during the Bash Script installation, the following error message on the screen:
main: line 1870: /usr/bin/pihole-FTL: No such file or directory
And firing the script again, am getting the following output:
pihole-FTL: no process found
/opt/pihole/updatecheck.sh: line 56: /usr/bin/pihole-FTL: No such file or directory
Thus, not sure how robust the installation process is...