You shouldn't need to install it at all. The compiled help file is just a file that you download and open. Windows will recognise the format and support for this file format is part of the OS. You may find that with Windows XP SP2 or Server 2003 SP1 (may be other conditions too) that the file may not open correctly due to security settings. If you view properties of the chm file, on the General tab below the attributes there may be a security message that say "This file came from another computer and may be blocked to help protect this computer". If this is displaying then click the "Unblock" button next it and open the chm file again. Cheers, Jeremy.