The setlic utility is used for when the licence has expired on a workstation or server connected to the AVG Admin Console. It is not possible to change the licence number in the AVG UI in this situation so the avgsetlicx tool can be used.
We can provide this to you if you are in this situation.
2012 and 2013 editions are attached. Edit the bat file to include your licence after '=' and to point towards either the 2012 or 2013 avgsetlicx*.exe file. (Password for attached zip is your login email address)