Is Procite 5 compatible with Windows 10?
No, I don't think ProCite is available for Windows 10 because there is no information on the official website regarding its presence. I've also used the Search query and ProCite doesn't appear anywhere. Only the developers know what has happened with the application and how to proceed further.
Use the following page to reach the developers: http://thomsonreuters.com/en/contact-us/sales-and-account-inquiries.html
Note: Click on the desired field and the contact form will load.