You can find your serial number by signing into your Autodesk Account under "All Products and Services".
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For manual activation, you can generate a request code through the product activation wizard by selecting "Request an activation code using an offline method". You can find your serial number by signing
Using unauthorized "crack" files or "keygens" is not recommended for several reasons: AutoCad LT 2007 Lost activation - Forums, Autodesk autocad-2007-crack-with-keygen