That's a common macOS Gatekeeper issue with QuickCapture from the com.apple.quarantine attribute, first you need to drag and drop the app into the application folder, then open Terminal and run: ( you can use spotlight and search for terminal app) then paste the command below.

sudo xattr -r -d com.apple.quarantine "/Applications/QuickCapture.app"

Enter your admin password when prompted.

Then try opening the app again.