To run the English 64-bit version effectively, the official system requirements included: AutoCAD 2013 System Requirements | Article - cadpilot

If you are planning to run this software on a machine, ensure your hardware meets the baseline for the 64-bit version:

Ensure the installer automatically detects the 64-bit OS. Manually check “Install 64-bit version” if prompted.

: For the first time, additional languages could be added via packs without needing a full software re-installation. 64-bit System Requirements

Improved solid editing: PressPull allowed extrusion of complex surfaces, while Offset Edges made 2D layouts from 3D edges seamless.