In the past year or two, there has been a shift on the web to disable TLS 1.0 and 1.1, with sites preferring TLS 1.2 or higher. StorURL is built on the older .NET 3.5 framework for maximum compatibility with systems as low as Windows XP all the way up to the latest versions of Windows 10. Unfortunately, this version of the framework does not have native support for TLS 1.2 and higher. Microsoft has released a patch for this, but it seems that it does not always get deployed via Windows Update. I did not realize this when implementing support for TLS 1.2 in the code, as it worked on all of my initial test systems. As I have encountered more systems, it appears that there is a reasonably large number of Windows computers out there that did not automatically receive this patch through Windows Update.
I have created links directly to the necessary patch from Microsoft in the Prerequisites section of the StorURL application page. If you are having problems launching the latest versions of StorURL, this is most likely the issue you are running into. There is a different patch download depending on if you are using Windows 7 or Windows 8/10, so make sure you grab the correct one.
If you have installed this patch, and you are still unable to launch StorURL, please get in contact and I'll hopefully be able to help troubleshoot and resolve the problem.