Just Click on the picture of the ScreenSaver you want and a "Save" box will appear. You might get a warning saying something like (this file may be harmful) but you can disregard it - that's just your computer looking out for you and trying to protect you from viruses. Then select the "Open File" button and the the ScreenSaver Instal Box will appear. Click on the "Install Button" and the screensaver will be automatically installed on your computer.
Alternatively, you may also "Right-Click" on the screensaver image and select "Save Target As" which will download the screensaver install file to your desktop. Then double click the icon on your desktop and it will automatically install the screensaver on your computer.

Plantet Tic Space Station

Create Your Tics Companion

Planet Tic Official Screensaver