To use a Minecraft client downloaded from the Hack vs Hack forums, follow these general steps:

: Open the .zip file. If prompted for a password, the default password is often hvh.net (case-sensitive).

: Methods used to reset sprint and deal higher knockback to opponents.

: Avoid injecting .dll files or running unknown software on your main operating system. For maximum safety, test such software only within a virtual machine to prevent your primary files from being compromised. Common PVP Mechanics in 1.7

: Open the %appdata% folder on your computer and navigate to .minecraft .

The file 1.7 hackvshack.net.zip appears to be a compressed archive containing a hacked client for Minecraft version 1.7 (specifically versions 1.7.2 through 1.7.10), typically hosted on the Hack vs Hack community forums.