Use software (such as 360 security guards) to forcibly uninstall, leaving no trace. You can refer to my blog post ★ Maintain the computer → Reduce the weight of the system → Make room/s/blog _ 4a1faae60100g8nf.html (you can also use Baidu search engine to find keywords).

Then install a cracked software. You can download it from my (Renren's computer) 99 disks. One path is: 99 discs \ ★ cultural collection \ ☆ cultural editing \AutoCAD2009.

If you don't understand anything, you can write it down on my website "Please leave a message" and I will reply.