Yes, this pack is 100% Royalty-Free. All individual sounds inside this pack can be used in commercial projects without any problems. Please note that for packs including DAW project files (templates), you may use individual elements from the template but you may not release the project as it is.
After payment, you will be sent to a "Thank You" page that will contain allow you to download your files instantly. Secondly, you will also receive an email confirmation with the download link(s) inside. Finally, if you purchased as a logged-in user, you can find your downloads on your Account page.