Problems with installation of draft sight

Hi, 

i' got the program pro since few month on a mac .

This mac got a lot of problems and i had to give it back to the shop.

Now, i would like to make the installation of the program on an other mac , this is impossible because the Key installation of draft sight pro is always linked with the old MAC.


How can i make this installation ,???


Thanks for the return and sorry for my english i'm a french guy ;)