You can’t blame avast for trying to protect their revenue stream against businesses using the free version.

Unfortunately some avast free users, if using a domain network to share connections, etc. and have large numbers of systems attached look like a small business network. The limit has been raised to 5 before this pop-up would be used, on the occasions that it is deployed (which I don’t think is a permanent thing but a periodic one).

The raising this number to 5 computers on the network, should cater for the majority of homes, unfortunately even that number wouldn’t cater for extreme cases like yours. You can just dismiss the pop-up if you aren’t using the systems for business purposes.

See extract:

and