Changed your mind? No hard feelings, and no questions asked.
Click Keep. This shows up for new apps that aren't famous yet.
Click More info, then Run anyway.
That's it. Click Fifi to pick sounds or press Record.
Why the warning? Purrclick is new and made by a small team, so Windows doesn't know it yet. It doesn't change system files and never records what you type. The warning goes away once enough people use it.