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I install my AutoCAD LT 2011 license without any problems (intstall and reinstall 2 times) but when I'm trying to activate it this is what I always get (please see attachment.)
See the following link from autodesk LT knowledge base.
http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=6404339&linkID=9240817