Allow Installation of Application from Unknown Source in Mac 

If Mac is not allowing you to install/run application from unknown source, go to command line and run the following command:

    sudo spctl --master-disable
    
Now install or run the application that was previously blocked. It should work fine. 

If you don't care about security then you can close the terminal and continue to work. 
But if you do, go to step Step 2.

Optional Step 1:
Now if you go to 
System Preference -> Security and Privacy
you will see that Install From Anywhere is enabled. 

Optional Step 2:
Go to command line and run the following command:

    sudo spctl --master-enable

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