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Their claims that secure DNS is not part of the free version are not true, at least part of it is. You can verify it by tracing a “nslookup” command, it is going to Avast dns server and if you have a local network the IP will be changed or unknown. It is not possible to disable this in the settings of the free version.
So after quite a few years of using Avast I have finally decided to uninstall it and use something else as I had to disable it by stopping the server anyway.