http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=6418567&linkID=9242019
Are you sure you are downloading the correct Hotfix for r10
http://images.autodesk.com/adsk/files/ts1069046_r10.zip
Also, students can download free Autodesk Inventor Professional 2008 from http://engineersrule.org
(and you would want to download the AOEMViewer Hotfix and Service Packs 1& 2)
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