Download the zip and run the contained installer. That’s why we have built a signed version of Soundflower which will work on OS X 10.10, 10.11 and the new macOS 10.12 Sierra. Read: Automatically Transcribe YouTube Video/Audio using Soundflower on Mac If you download Soundflower setup from Google, you are most likely to get Soundflower installation failed error.
However, after the latest macOS updates, the recent version of Soundflower has stopped working on Seria and High Seria. I’ve been using Soundflower for the past 3 years and never had any problem.
For the unknown, Soundflower is a software that helps you route sounds to any Mac app instead of the default speakers. Wheather you want to record your favorite radio station or the video game music playing on your Mac, Soundflower is the most popular option out there.