There is a new trial version (http://www.wyrmkeep.com/ite/download.html#windows) of Inherit the Earth: Quest for the Orb for Windows. This new version fixes an audio bug that was introduced in Windows Vista and Windows 7 when Microsoft deprecating the DirectSound API.
We are working on a "super" updater that will upgrade and fix any older release of the game for Windows. This will replace the hodge-podge of updaters currently required. It should be available RSN.
The new "super" updater (http://wyrmkeep.com/ite/update.html) in now available. This will update any version of Inherit the Earth for Windows.