I don't know what you're referring to -- there isn't any "new web action by the installer", and it never sends you to a web page to sign up for anything.
The only thing I can think of is that your IP has gotten itself into the "extremely bad boy" list (on Google or Project Honeypot). If you're on the lists, our proxy server (CloudFlare) will require you to enter a captcha before you can connect to the web site. This isn't new; it was implemented about three months ago. (Though your presence on the list might be new.)
If you've got a dynamic IP, then it's likely that one of your neighbors has been misbehaving.