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Ok so i've done a workaround for AutoCAD LT 2015 (which comes as part of the suite i've just bought) by downloading the trial version and its accepted the seriel no and product key.
Thought i could do the same with Revit LT 2015, but the free trial for Revit LT is the full version (why????) so product key for Revit LT not recognised. Autodesk - how am i meant to get Revit LT 2015 onto my computer?