If an earlier version is already installed then only the Upgrade pack is usually needed to run HaloSim3.6.1

To install the upgrade pack

• DOWNLOAD the UPGRADE PACK (359k)
• UNZIP into any folder using a 32bit unzip facility and allow overwriting of any existing Halo files. First copy the older files elsewhere if you wish to keep them. No further installation is needed.
• RUN HaloSim361.EXE from Explorer, START - Programs, or create a desktop short cut.