Q: Wireless  printer problem

Xfinity upgraded our wireless router last week.  Our 5 year old HP Envy wireless printer will not stay connected to our 5 year old iMac.  The printer install CD will not work with the OS 10.9.5 currently on the iMac.  Xfinity referred us to HP; their solution is a two-hour remote "cleaning" and "driver upgrade"; the printer worked fine before the new router was installed.  We went through the online trouble shooting from HP and have wireless network test results showing all is supposedly in order.  The only thing that does not match is the IP Address on the "Current Configuration" Test Results and the IP Address that appears in the error message.

Any suggestions on what we should do?