Autocad 2010 [OFFICIAL]

If you have a hard drive full of DWGs from 2004–2010, older versions of the software open them without corrupting proxy objects. Newer versions often strip out old AEC objects.

If you learned CAD in 2010 or 2011, you likely remember the stress of learning "Parametric Constraints" for the first time, or the joy of attaching a PDF that didn't pixelate when you zoomed in. It was a mature, stable release that respected the keyboard command purists while gently pushing everyone toward the Ribbon. Autocad 2010