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Hello jana2910,
The Visual C++ 2008 SP1 Redistributable (x64) is needed for installation.
If you try to install the component from 3rdParty folder of the installation package directly in your machine, can be successful?
I think it should still be failed.
You can try to uninstall all the Visual Redistributable components from your machine (including the 2010 version), restart machine and install AutoCAD LT 2012 again to see whether can be successful.
Regards,
Helen