The most recommended and legal way to obtain AutoSketch or any Autodesk software is through Autodesk's official website or authorized resellers. This ensures you receive legitimate software with support and access to updates.
For modern alternatives that offer similar precision 2D drafting, you might consider AutoCAD LT or free options like to AutoSketch or instructions for transferring an existing license to a new machine? AutoCAD Keyboard Commands & Shortcuts Guide - Autodesk