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A Halo deal from AppSumo gives you a licence key that works exactly like one bought on withhalo.app. There’s no account to make.
1

Activate on AppSumo

Open your AppSumo products, find Halo, and press Activate.
2

Get your key

AppSumo sends you to withhalo.app, which shows your licence key. Press Copy.
3

Unlock Halo

If Halo is installed in that browser, press Unlock Halo in this browser and you’re done. Otherwise, open Halo’s popup, click Unlock, paste the key and press Unlock.
Your key works in up to 3 browsers, or 10 on the team tier. Lost it? Press Activate on AppSumo again and you’ll be shown it again.
If the page says the link “has already been used or has expired”, go back to AppSumo and press Activate again. Each link works once.
Refunds go through AppSumo, within its window. A refunded deal’s key stops working.