First, I should recall the different ways users can acquire Adguard. The official way is purchasing through their website. Lifetime licenses used to be an option, but I wonder if Adguard still offers them. I know that some companies have moved away from lifetime licenses in favor of annual subscriptions, so maybe that's the case here. I should check Adguard's current policies.
Steps to purchase: visit the Adguard website, choose the Premium plan, select a payment method (credit card, PayPal, etc.), and purchase. After purchase, the license key should be sent via email. Then they can enter it into the Adguard app. Adguard Premium Lifetime License Key
Also, users might not know how to activate the license or might have issues with activation. Including activation steps could be helpful. Plus, troubleshooting tips if they encounter issues. First, I should recall the different ways users