The download URL on their website is not working correctly in order for me to save the package and install it on Windows 10. Therefore, it's impossible to say if it works on Windows 10 or not. However, if you still have a package, right click it and choose Properties > Compatibility. Select Windows XP from the list and then start the software. Additionally, run the software as Administrator.
You can also ask the developers directly about this: http://www.currentcost.com/contact.html