Google Earth Pro Download Problem

I have MacBook Pro using El Capitan 10.11.6 version. I am unable to run download from Google to be able to use Google Earth Pro. After downloading from Google.com and moving to hard drive I get the following message:

"Google Earth Pro" can't be opened because it is from an unidentified developer. Your security preferences allow installation of only apps from Mac App Store identified developers."

If I go to iTunes or App Store the only Google Earth App listed are for iPhone or iPAD so I tried and could not download MacBook this APP from Apple or if downloaded from Google the MacBook Pro will not allow it. Please advise how to install. I had an older version of Google Earth before but I uninstalled it because it did not work well after updating to El Capitan. Thanks