All the Doki products are now available through the App Store which could mean that Windows is discontinued, therefore the errors related to compatibility. You could try running it in Compatibility mode using right click on file, but it's not guaranteed that it will work properly and more errors might appear.
Instead of messing around with the application, use the following link to reach the developers to ask them officially if the software is still supported on the Windows operating system or not: http://www.dokispeak.com/contact
