Delphi Community Edition registration limit

I am trying to install Rio CE on another computer. I used my CE serial number. The response is that I need a limit increase. I asked for one via the support form. Support replied that was for the commercial edition and that I should look in the CE forums/FAQ  Answers.

I have searched but do not find an answer. (the Answers page has gone 404.)

OK, how do I get an increase?