How can I add more seats to my existing legacy License?
If you’re looking to add seats, devices, or additional users to your license, you have a couple of options:
You can migrate your license to a Teams subscription — it comes with additional benefits like a shared team workspace on Cloud, free access for unlimited Viewers (to view designs in the browser and use Cloud Inspector for handoff), and easy team management with monthly or annual billing. Find out more about Sketch for Teams.
If you purchased your license from our site, and cannot move to a subscription yet you can add seats to your license. Head to our License Manager to get started.
If you are an educational institution, please send a request with the number of licenses you need through our Education Store. We’ll get back to you as soon as possible.

Documentation
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Legacy licenses
Manage, renew or recover legacy Mac-only (SK3) license keys.