Newbie and INstall from dvd help

So i downloaded the 64bit iso, using isobuster. and burned the entire content of the file for Asterisknow 6.12.65-22-x86_64. I put it into my clean computer and it does nothing. So i then downloaded and burned the boot.iso, the system boots i press new install it does it thing, then i get a popup on the screen The PBX disc was not found in any of the CDROM drives. so i then burn install.img, put that in and hit ok, still same error. I then burn the isolinux files, put it in and get the same error. what am i doing incorrect?
The help is greatly appreciated.


so it seems to me its looking for my current PBX provider software, what if i don’t have this, its an ESI system ??