You will need to find the file on your computer and unzip it before you will be able to use the products in Photoshop.
In Windows, you can usually right-click on the zipped file and hit ‘Extract All’ – this will unzip the file and allow you to use the products within.
On a Mac, you can usually double-click the zipped file and it will automatically extract for you. If it doesn’t, you can right-click on the zipped file and select Open With > Archive Utility (default).
If your computer is unable to extract a file, you can do a google search for a free program to do it for you. I like using 7-Zip, but there are many others you can find.