In zip file you will find a catalog with plugin:
Now you should copy it to the [your nopcommerce website directory]\Plugins
You can also upload it directly from the admin panel, just use the “Upload plugin or theme” button in the [Configuration/Plugins/Local Plugins].
After that, log in to your admin panel and go to [Configuration/Plugins/Local Plugins] and click [Reload list of plugins]
Please find [QuickProducts] on plugins list, and click Install.