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Your third image already told you “Thank you for Activating Avast Free”
All you had to do was close that screen, (X in upper right corner) and you would have been finished.
There wasn’t any need to select the free trial.Once you do that, you’re no longer using the free version.
i resolve this problem by full uninstall then install again ( do not login into your account before active !!! )
i think avast is free for only 1 year!!! the u have to try internet ver !!!