Download the screensaver: Windows 10/8/7 AlysTheThief-pc.zip Unzip, then doubleclick AlysTheThief-pc.msi to install. To change any preferences for your screensaver, go to your Display properties in the Control Panel. Mac OSX Mojave and higher alysthethief.saver.zip Unzip, then doubleclick the saver file to install. Mac OSX High Sierra and earlier alysthethief-mac.zip Open file after download completes and it will automatically install itself as a screensaver.