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We want you to know that payment is never required. You are welcome to use AdBlock without paying, and to reinstall it as often as needed without paying or paying again.
Our payment page opens each time you install AdBlock. If you didn't pay at that time, you can make a contribution at any time on our website at https://getadblock.com/pay. If you are interested in our Premium features, please see this article: What is AdBlock Premium? How do I upgrade?
You can pay using many debit or credit cards or via your PayPal account.