HTML Help itself requires that IE3 or greater be installed. When installing to Windows NT4 you must be logged on with full Administrator privileges. You should also have NT service pack 3 or greater installed. Windows 2000 already has HH 1.3 installed. Only an official MS Service Pack will update these systems.
Earlier versions are too unstable.
Later versions contain bug fixes and are more stable. See HH version info Again note that Windows 2K and ME can only be updated using an official MS Service Pack. These buttons seen on MSDN window are not available though MS HH Workshop. You can enable them by using the FAR HTML Help Project Editor. This button seen on MSDN window is not available though MS HH Workshop.