Ok, read the sticky at the top of this section. It's had some recent additions to it that might help you.
If you want to run without any firewalls...good luck.

No-one forced you to buy Pro, you could've got the basic version for free.

If it was working fine, then one day just up & quit then there has to be a reason. Have you looked at your modem/router as being a possible cause of firewall problems??