Not an earth shattering problem. I use soundflower extensively to facilitate screen recordings over Facetime on my iMac. Without it, it is really difficult to record system sounds as well as my external mic.
After updating to OS X El Capitan I found that soundflower simply wasn’t ‘there’ and didn’t/wouldn’t run. A quick google brought me to THIS PAGE – with the instructions working perfectly. Only thing I did differently was delete the old soundflower from the system – and yes, the uninstall soundflower option did still work.
So far so good – no major problems and the software I’ve been using that relies on soundflower is back to normal.
For those interested, there is some background information HERE explaining the problem.