“Logitech Webcam Software.mpkg

I'm trying to install a webcam but I keep getting this messageLogitech Webcam Software.mpkg” can’t be opened because it is from an unidentified developer.

Your security preferences allow installation of only apps from the App Store and identified developers.

“Logitech Webcam Software.mpkg” is on the disk image “lws220.dmg”. Safari downloaded this disk image today at 6:12 AM from support.logitech.com."

What can I do to get around this