According to its official website, the last Windows version supported by the application is XP, but it should still work on Windows 10. In case it doesn't, you can try running the application in compatibility mode by right-clicking its executable, then selecting Properties and going to the Compatibility tab. In that menu, look for a box with the text Run this program in compatibility mode for, then select Windows XP from the drop-down menu and click Apply.
Alternatively, you can set up a virtual machine on your PC, install Windows XP on it, the run Ava Find from there.
