system
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Thank you, Tech, for the detailed response.
Maybe, though, it’s just a language thing.
For example, I didn’t think the OP was stating anything about Avast “forcing” an upgrade.
The way I read it was that the OP was stating that link in the popup window leads to some kind of page other than what he/she was expecting. I’m afraid I don’t know to what page that link leads. If somebody could provide an address, it might help.