Your answer is given in ReadMe file included along with the installer
To Uninstall
Open the "/Library/Screen Savers/
" folder and drag any unwanted savers to Trash.
I also expanded Install Everything package and found there is a preinstall script that mentions, install Screensaver and updater in /System/Library/Screen Savers/
So remove any unwanted screensavers from /System/Library/Screen Savers/