Installation setting in system preferences

why i can't install any application in my macbook?
this is the example.
i wanna install get lyrical. my macbook prevents it. it says like this:
"get lyrical can't be opened because it's from an unidentified developer"
"your security preferences allow installation of only apps from the mac app store and identified developers"
please tell me how to deal with this.

System Preferences > Security & Privacy > General > Allow Applications downloaded from Anywhere
Be sure to:

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