"The HaloCE for Windows v1.07 Hotfix addresses a bug. It is NOT a mandatory update, you will not get it through the Auto Update, you need to download it manually. "
Halo Custom Edition Hot-Fix v1.07: HaloCE Hot-Fix v1.07: The HaloCE for Windows v1.07 Hotfix addresses a rare hang that could occur if a malicious individual (hacker) purposely imitates a game client and sends invalid data to a server. This hot-fix changes the version number of HaloCE for Windows and the HaloCE for Windows Dedicated Server to v1.07 from v1.0z
Instructions for installing the Hox Fix:
1) Save the Hot Fix File to a folder on your PC. Remember to "save" this file, don't try to "open" it directly from the Web site.
2) After saving the file to the proper location, double-click the exe to install.
The update is NOT mandatory, you will not get it through the Auto Update in HaloCE, you need to download it yourself"