I own Creative Suite 6 Production Premium, after installing a new motherboard problem

After installing a new motherboard the software is asking for the serial number/activation code. When I try to input it I get a message the the computer can't connect to the internet (but it is connected). I've owned the software since 2013 and never had a problem like this. I did not uninstall the software or change the hard drive, only the motherboard. How can I solve this problem? I am a missionary and can not afford to get a subscription, need to be able to use the software that I own.