How-To Geek

recent days,i attended a presentaion given by my friend in class-room.he did a magical trick in his presentation.he visit the site which allow payable software and shows amount of each software.he reduced the value of one software to 0.00 dollar and download that software in free.it was really so interesting.how is it possible?

Many ways to do what you ask. Some are as you say a magic trick and not actually done in an online site just appear that way. Others are an illegal hack. Best to steer clear of the latter. Also, it won't be discussed here.