iAtkos v7 The installer could not validate...
 

Hello guys!
I'm trying to install iAtkos v7 on my computer. I reach the Installer screen but when I try to install it, it gives me: The installer could not validate the content of '10.5.7.Intel'

MD5: OK
Burned on: USB Key (With Disk Utility tool)(Bootloader with UInstaller, a Utility on mac.)

Ps: I Burned it on a usb key because, otherwise I get Still Waiting for Root Device...

Please help me!