You've tried lots of things, but did you do the thing I suggested in my post above? Namely, did you go to the License menu within Hero Lab and select "View License Information"? What does it show there?
Everything is correct on our server. Based on the symptoms you're describing, it sounds like the license reactivation process may be failing for some bizarre reason. But I honestly can't make that determination until you provide the answer to the above question. I need to know what content your copy of Hero Lab thinks it has access to, which is displayed by the above option.
There's one other thing to try. Please go to the Tools menu, then the Diagnostics submenu, and select Check Internet Connection. Are any error diagnostics reported? If there is an issue with the license reactivation logic, this info will help diagnose what's interfering with it on your computer.
FYI, you can re-install your license on the same computer a hundred times and it will continue to work fine. The only things that would cause it to fail are things that change the "identity" of your computer, which are pretty major changes. For example, upgrading the operating system would do it.
These forums are only monitored sporadically by the various developers. The standard support queue is generally monitored daily during the week, but not always. However, the queue is monitored infrequently over the weekend, hence the "2-3 day" response timeframe promise. Usually it's a lot faster than that. You happened to get lucky that I was watching the forums this afternoon and jumped in with this issue.