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I have tried downloading the installation file and running the installation from the Subscription web site.
Each time I recieved the same error. My anti-virus was disabled when running the install.
I had my IT department verify the some file are being extracted but not all to finish the installation.
Unexpected end of archive... are you sure you downloaded *all* of the installation files?
I used the download manager from AutoDesk's website. The only file it download was "AutoCAD_Mechanical_2011_English_Win_32bit.exe"
Sometimes the download manager is problematic. You might use the alternate download method instead.