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The main menu and gog report this at "1.02" this is a confusion as a result of the weird menu version display as it report 1.0002.0001, which looks out of date but its the latest patch (1.2.1b) which added two extra mp maps: Citadel of Sorrow and Dingo's Pass (which are present in the skirmish and mp menus) and the properties for the exe file state it is 1.2.1b.

so fear not! its at the latest patch. 1.2.1b