Note: For Mac install help go here.
The windows installers are .exe files. There is nothing special that you need to do. Just close Photoshop first. Then run the .exe file and follow the prompts. Then restart Photoshop and it will be installed. The exe installer file downloads are on the DOWNLOAD PAGE. If you have Photoshop installed somewhere other than the C: Drive or are running Windows 32 bit then you will need to use the alternative installer method shown below.
This tutorial video is for the alternative installation method. The normal .exe installers won’t run on 32 bit computers or if Photoshop isn't installed on the C: drive. However, the alternative script installers on this page will work for ALL systems, including 32 bit and with Photoshop installations on any drive. You can get the alternative script based installers on the ALTERNATIVE DOWNLOAD PAGE.