anybody know why my app isn't opening?

[Microsoft Windows]

im trying to use the nexus app for my pc case. I've already downloaded it before, and it was working perfectly fine. However, It randomly stopped working and now every time I try to open the app, it asks "do you want to allow this app to add changes?" and then doesn't open anything. I've tried uninstalling and reinstalling multiple times and nothings happened.

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