This updated client for Half-life fixes some bugs and adds new features and settings. The most important is bunnyhop support.
This models replaces default helmet model so you will be able to see players with custom models better. It also inludes red and blue models from AG.
Thanks to this upgrade you will be able to set up your weapon binds and scripts directly in Half-life menu. There is no need to create your own config file. It extends game menu with few more settings.