.dmg for Chrome browser install won't open

Hi, my older MacPro running OS X Yosemite 10.10.4 seems unable to run the .dmg installer for Google Chrome. Thanks for any tips to guide me to correct or troubleshoot this issue. Once the file is downloaded from Google by Safari, I "open" it and then the Chrome installation applet opens a small window with an icon for installation, when I click that instead of running the installer it opens my Apps folder in a new window.