After many years, I decided to finally upgrade my mid-2009 MBP's OS from Snow Leopard to the current version of El Capitan (10.11.5), since I just couldn't see any advantage to upgrading before that and SL did all I needed. However, due to my work requiring an upgrade to Citrix, which wasn't supported by SL, I had to make the plunge. I got TotalFinder (I still can't believe Finder hasn't implemented several of the features in that app) to work after using a workaround, but Parallels doesn't work, even though their website says it is supported by El Capitan. I'm guessing it is supported by previous versions of El Capitan, but not 10.11.5? Does anyone have Parallels working on 10.11.5?