The hires_headcrab_v1.zip file you have requested: Skins / Monsters / Half Life 2 Hi-Res Headcrab Skin - 1.35mb is not available. Perhaps try browsing all files for the game Half-Life 2 and upload any files you want to share or are missing. This is the only information we could locate:
Someone's been inspired! ;) Ness has created a hi-resolution headcrab skin for the original headcrab. One of the most noticeable changes is that the headcrab is "brighter" colored, and is now almost orangish instead of the original tan. Another change is that the detail has been upped, obviously, due to the skin being hi-resolution. Overall these are pretty good replacement for the original headcrabs if you're looking for something different.