I don't have my computer with me for a while, why don't you use unlimited.io HBOOTs? They also by pass the CID check and you don't need sigtool if you use them, if you already have my HBOOT installed, you can upgrade to unlimited.io HBOOTs by executing fastboot flash hboot <NAME OF THE FILE> or following the instructions in their site.
Anyways if you really need sigtool, you can compile it from source.
New link
https://www.box.com/s/77d2187400b5cece5daa