For now, the latest version of Windows which is confirmed to be completely compatible with WiFi Tunes Sync Pro is Windows 7. You can try to run the program in compatibility mode or wait for an official update for Windows 10. The developer recommends to try and use it if your OS is newer than Windows XP even if your system is not listed as compatible. According to official information from the developer, the program should work fine. But, in order to make sure that you don't encounter problems you should try the free version first.
You can check for system requirements on the application's page at Play Store: https://play.google.com/store/apps/details?id=jp.vier.music.sync&hl=en
Tip: Click Read More on the page to reveal the system requirements.