OSX El Capitan w/ P99
 

FWIW, I downloaded the beta for El Capitan right away (version 10.11 Beta (15A215h)) and immediately discovered that P99 would not launch. I did some digging and it turns out that Wineskin is currently not compatible with this version of OSX. I just wanted to give a heads up to those considering the beta (or live upgrade). I'm planning to revert my mac to Yosemite later this week for a trip I have to take and will reinstall the beta after I get back if there are any wineskin updates or beta updates. I have tried creating my own wrapper as well and Wineskin is just flat out incompatible in its current state.