I bought the subscription on the AdGuard website

If you purchased your subscription on the official AdGuard website, an AdGuard account is automatically created and linked to the email address you used during checkout. You can use this account to manage your subscription and activate your license on other devices.
If you want to change the email address linked to your account, please contact us at support@adguard.com.
Downloading AdGuard To install AdGuard, click the file indicated by the arrow Select "Open" and click "OK", then wait for the file to be downloaded. In the opened window, drag the AdGuard icon to the "Applications" folder. Thank you for choosing AdGuard! Select "Open" and click "OK", then wait for the file to be downloaded. In the opened window, click "Install". Thank you for choosing AdGuard!
Install AdGuard on your mobile device