Install cancelled by user

[Kristenfair]

I'm obviously no expert, so I'm not going to be able to provide much details about the problem. I've enabled developer settings “USB Debugging”, “USB Debugging (Security Settings)” and “Wireless Debugging”, but it still doesn't seem to work. Is there anything else I have to do?

(The apk is incompatible with my device, and I've been told this app would help with it.)

[zenxvolt]

You can try enable "Install via USB"