This is a premium plugin, so if you want to use it, you'll have to purchase it from WooCommerce.com. Perform the following steps:

1. Purchase WooCommerce 360º Image on WooCommerce.com.
2. Download the zip file with the plugin.
3. In your WordPress site, go to Plugins | Add New and upload the zip file.
4. Activate the plugin after it has finished uploading.

That's all we need from an installation standpoint. Now, to configure it with our products.

If you don't have your own photos, the page for WooCommerce 360º Image links to a zip file, which contains a few example images.