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: After purchasing, download the installation package from the Avast website. Run the installer and follow the on-screen instructions to install Avast Premium Security on your device.
– Even if a cracked key works offline temporarily, the moment your computer connects to the internet, Avast’s servers will flag the license as invalid or blacklist it. You will see a red “Subscription expired” or “License invalid” message.
Avast Premium Security | Online Security — Up to 10 Devices