system
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Although saying that no reboot is needed sounds “too much” IMO, I would not say that installing over the top is “never” recommended either. It is true though, that a clean installation (after removing ALL remants) usually solves most problems, when the problems are dependant only on avast.
In fact, sometimes the repair of avast fails, and installing over the top (and rebooting) could solve the problem without the need to re-configure avast anew.