IMPORTANT: The 30- or 180-day trial versions of AutoCAD can each be loaded only once on a single computer. This applies to all 30- or 180-day trials regardless of where you obtained them, including from other Exercise Workbooks by Cheryl Shrock. For example, the 180-day trial from the Advanced Workbook will not install on a computer on which you previously installed the 180-day trial from the Beginning Workbook.
Autodesk recommends that you uninstall the 30-day trial prior to installing the 180-day trial or vice-versa as the case may be.