If you have purchased Serato Video or upgraded your license from Video-SL, the license is registered to your Serato.com account. Simply signing into the Serato.com account that the license is registered to, will automatically activate that license. See more details via our How do I activate my Expansion Packs in Serato DJ Pro? article.
To your Serato Video license, click here to navigate to your Serato My Account page, then click on Show licenses under the Serato Video product card.
NOTE: If you have purchased your Serato Video license in a bundle (for example, with Serato DJ) you may not see it listed in My Account via Serato.com. In this case, simply sign-in to Serato DJ Pro as per the steps suggested above, to activate your license.