Did you know you can do this in autocad?
UrbanLISP
AutoCAD AutoCAD AutoCAD

When you purchase a command an account will be created for you. With this account you can download the commands you bought 30 days after you purchased them. The loginname and password will be send to you through email. If you haven't received an email please check if your email provider considered the email as spam. You can use the loginname and password to login here.