Originally Posted by maciclazar
Just do everything manually.
Unlock bootloader at htcdev.com
Use twrp to get root or flash custom rom
Folks that keep asking for a new link should actually read the thread. Then they would see (along with posts all over the M8 section) that the tooklit is long obsolete. It contains very old (and obsolete) versions of TWRP and SuperSU that will cause all manners of problems on M8 models with any remotely recent OS versions (which is the huge majority of M8 phones out there, at this point).
All the toolkit does, are things you can do with single line fastboot commands; or just clicking through HTCDev.com. If you can't manage those things without a toolkit, you shouldn't be rooting the phone in the first place.