Obviously, step one would be to have VoidTools' Everything Search Engine installed and running as this app is not standalone. Also, you will need to have Microsoft .Net 5.0.x installed; if not, it is offered during installation. It is worth mentioning that there is nothing wrong with the Everything Search Engine as is but many like a dark interface.
Everything.NET does offer a few additional functions over what Everything Search Engine has, like the ability to right-click on a file to access the Explorer context menu, and double-clicking shows the file in File Explorer, for instance. For those that prefer a dark interface, Everything.NET will fit the bill, and the additional functions are a welcome bonus.
ESC key closes the app
Up key restores the search text from the last session