Hi KCHank,
I understand that after upgrading your internet service and router/modem, you cannot get the HP LaserJet Pro CP1525nw to install. I will try my best to help you resolve this issue.
In this document for HP Single-Function and Multifunction Printers - The Progress Bar on the Software Installation Stops or Stalls are steps that may resolve this issue.
I hope this information helps, please let me know how it goes.
Thank you,