Latest Version for QGC for MacOS

The latest download version I found for MacOS was V 4.05 but it is very slow to open and apparently the Joystick mode for throttle for forward and reverse
Where can I find the latest dmg file to download for MacBook Air? Anybody who can explain how to set the throttle servo parameters for a Rover
Note: The latest download version I found for iPad is 4.1 and the throttle servo seems to work properly for forward and reverse. Also no problem to start the application.