I have used the standalone desktop app for many years and now when I click the icon or try to run the progam (on Windows 10) the program doesn't start. I uninstalled and reinstalled the standalone app and the same thing happens; the little windows circle turns like it is thinking and then just quits, without the app ever starting. Please help.

Sounds like some conflict in your Windows configuration.

Please try the following:
1. Reboot your PC
2. Uninstall the sniper software
3. Navigate to "c:\program files (x86)" and delete folders myibay and myibidder
4. Reboot your PC
5. Download and install the software