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To use the server tools, you have to have the server, of course.
The IIS requirement might mean you have a version of Windows without IIS, or that you need to enable the IIS service in Services panel.
As for the error message on download... is that at the end of the download? if so, it might be corrupted on downloading, or even be the wrong copy for your version of Windows, e.g. you might have a 32-bit Windows and it could be the 64-bit version of MYOB. ?