Differences with rfxn.com version?

[elsiehupp]

I just installed prm from your website, and running install.sh on Ubuntu 20.04 LTS gives the following output:

.: PRM installed
Install path:    /usr/local/prm
Config path:     /usr/local/prm/conf.prm
Executable path: /usr/local/sbin/prm
./install.sh: 46: [: 1: unexpected operator

The version of install.sh from rfxn.com is not the same as the version on GitHub; among other differences is the line where the error occurs. In the rfxn.com version, install.sh ends with:

46 if [ "$cron" == "1" ]; then
47 echo "CronJob path:    /etc/cron.d/prm"
48 fi

Whereas here it ends with:

process-resource-monitoring/install.sh

Lines 48 to 56 in c245021

	if [ "$BASH_VERSION" = '' ]; then
	if [ "$cron" = "1" ]; then
	echo "CronJob path: /etc/cron.d/prm"
	fi
	else
	if [ "$cron" == "1" ]; then
	echo "CronJob path: /etc/cron.d/prm"
	fi
	fi

...which my guess is designed to suppress this error? (I don't know shell scripting.)

This is not the only difference between the two versions of install.sh... is there any meaningful difference between the two versions of prm? If so, which one is preferable?