Information about the version of Puppy is stored at /etc/DISTRO_SPECS
You can see this file by going to a terminal emulator and typing in the following code (ensure letter cases are ~copied exactly)-
To see just the version Name and Number, use the following code-
source /etc/DISTRO_SPECS && echo "$DISTRO_NAME $DISTRO_VERSION"
Open PupSysInfo go to 'System Specs' and select 'Distro Specs'