Is there an application that can read Circus Ponies Notebook files?

So, my computer (an iMac 3.06 GHz Intel Core i3 running OS 10.8.5) crashes when I try to upgrade to Mavericks. (But that's another story.) The last attempt, the non-software wizard that I am, I somehow wiped out my entire applications folder trying to restore it. But, luckily, I was I was able to restore my system back to OS 10.8 and download and restore all of my applications--and here's my problem--all but Circus Ponies Notebook 3.0, because they recently went out of business. ⚠😢

Because my computer stubbornly won't upgrade, I only have--(gulp) had--an old copy of Notebooks 3.0. (Ironically, the reason I wanted to upgrade was so I could upgrade Notebooks.) I was able to find and download a copy of 4.0. However, when I tried to buy the license, it sends me to a "Not Found: The requested URL /store was not found on this server"web page.

It's a great program and I've used it to organize just about all of my family's entire existence with it. You name it, it's in those files.

Does anyone know if there is a a reputable website that still has Notebook 3.0 available for download?

Or is there a program that I can use that at least can read those files so I can retrieve the text, pdf's, web links, jpegs, etc.?

Or, 😉😉 a license number? Kidding. (sort of...)

I am desperate.