How do i install the sims 2 without buying it

Hello, I have downloaded the sims 2 free time on my vista computer and I have put it on a disk. it says I need to install the sims 2, but the thing is it is illegal and without installing the sims 2 I cant open the game or play it. how do I download or get the sims 2 installer thing of the internet. it lets me open up all the things inside the file on the disc but not on the computer, there is nothing that says install but there is one to uninstall. I asked my cousin and he said that I need to uncrack it or something similar but I checked on the internet how to put games on discs and it said I only need to do that if I have a rar file and I only realized now that it is a rar file not a iso. how do I get it to play