Move dmg file from download folder to applications folder
Note: For the Mac to install focusro app , You need to allow the apps to be installed from unidentified developers using the following steps.
Open System Preferences.
Go to the Security & Privacy tab.
Click on the lock and enter your password so you can make changes.
Change the setting for 'Allow apps downloaded from' to 'App Store and identified developers' from just App Store.
If still the app is blocked go ahead with following steps:
Open System Preferences.
Go to Security & Privacy and select the General tab.
If you've been blocked from opening an app within the past hour, this page will give you the option to override this by clicking the temporary button 'Open Anyway'.
You'll be asked one more time if you're sure, but clicking Open will run the app.
Another way to open a blocked app is to locate the app in a Finder window.
Open the Finder.
Locate the app (it might be in the Applications folder, or it might still be in your downloads folder).
Ctrl-Click or right-click on the app.
Select Open from the resultant menu and the app will be opened anyway, and an exception will be created for opening it normally (i.e. by double-clicking) in future.