Apple states that Riffstation cannot be opened because it is from an Unidentified Developer (Mac)

To install software that has not been sold directly by Apple, you will have to change your Mac settings . This is done as follows:

  1. Go the Apple menu > System Preferences > Security & Privacy > General tab 
  2. Under the header 'Allow applications downloaded from', just select Anywhere

Alternatively, you can just right click on the Riffstation icon and click Open.

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