This could help you when you get the
"You failed to send the correct heartbeat" error.
-> Back up Freestyle GunZ first (as a .rar)
-> Remove Freestyle GunZ from your computer
-> Have your Anti-Virus off
Go;
Start » Settings » Configuration » Sytem » (TAB) Advanced » Settings (of presetation) » (TAB) DEP.
Remove all GunZ / Xiao's that are listed (if not you have the same as the image below).
http://i.imgur.com/4N3cV.png
Press OK.
Go; Install Freestyle GunZ again (unpack your .RAR backup)
Go (again); Start » Settings » Configuration » Sytem » (TAB) Advanced » Settings (of presetation) » (TAB) DEP.
Then add GunZ (launcher) + Xiao's Runnable to the list.
http://i.imgur.com/KTyzr.png
SOON updated.. (Images in English + more images / a video?)