I have KJPRO 1.5 and 2.5 also updated songs from Feb 2010 to Oct 2010 and I can't upload them.
The KJPro website doesn't provide anything related to Windows 10. They have a different product now that has no connection to the KJ Pro website. If you want, a direct contact can be established with the developers to ask them about this product. I am recommending this since you will get more information.