I want to activate AdGuard on a new device/I have reinstalled my OS
You can do it via your personal account
Go to your Personal account, open the My licenses tab and find the license you're interested in. There will be a list of all devices that this license is being used on. Reset it from the old device (or your current device in case of the reinstalled OS) by clicking on the little cross icon beside the device name. Now you can use your license key to activate AdGuard on a new device/new OS.
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The problem you’ve encountered needs further investigating.
Please email firstname.lastname@example.org. Our support engineers will get back to you as soon as possible.