Download Avast Free/Pro Antivirus/Internet Security/Premier from official site, and install it as trial.

First of all, you must uninstall any previous installation of Avast product using the Avast official removal tool – Avast Uninstall Utility (AKA: Avast Antivirus Clear, Avast Uninstall Tool, Avast Clear for short).

Otherwise, the unmatched program title and license will confuse you a lot. *** Every time you switch to or activate another license, do wait for its “Activating…” action to finish (i.e.: upgrading/downgrading the program files and title), and make a system restart to make it effective.

Restarting computer is usually required (otherwise you might not see any changes).

Select the one you’d like to use on your computer from multiple licenses.

Open the corresponding license file (.avastlic).

Open Avast product, and enter “ Menu/My licenses“.

Download and install the latest version of Avast ( offline installer) from official site as trial ( Premium Security Multi-Device is highly recommended, other editions may be failed after restart – go back to free edition immediately).

Set the hosts file to be “ Read-only” as soon as possible (but probably fails).

127.0.0.1 # will be removed by Avast in about 3 seconds.

Run the “ Host Blocker.bat” as administrator or add the following lines to your hosts file manually:.

Uninstall Avast completely with tools like Total Uninstall, Uninstall Tool.

Use the universal activation code above to register.

Enter “ Menu/My licenses“, and click “ Enter a valid activation code“.

Download and install the latest version of Avast antivirus product from official site.

127.0.0.1 (will be removed by Avast in about 5 seconds).

But you may still be able to use it by adding the following lines to your hosts file: *** Some activation codes fail to work now.

Avast Premier (now called Avast Premium Security).

Avast Internet Security (now called Avast Premium Security).

This post keeps up updating all the universal working license key files (as of this writing, it is valid till up to 2028) for Avast 2012 ~ 2021 all security products, including Avast Free/Pro Antivirus/Internet Security/Premier, and more. This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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Avast cleanup download with trial