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How do I fix it when Windows says that "this app won't run"?

Later Windows operating systems have default settings to restrict what programs or apps can run on the system.  If you are seeing a message that says something to the effect that "this app(lication) cannot/isn't allowed to run on this system", you can change your settings to allow Notation Software (and other Windows-compatible software) to run on your machine.

For Windows 8 systems, please see the article at https://www.howtogeek.com/75356/how-to-turn-off-or-disable-the-smartscreen-filter-in-windows-8/

For WIndows 10 and 11 systems, please see the article at http://www.thewindowsclub.com/sideload-apps-windows-10