First go to the home page of the software you want a copy of. Many sites offer demo versions of their software. Some give out full copies that just don't work after about 30 days, while others have limited features, and you have to pay to receive the full copy. You want the first one, which has all the features for a time period, because those are the easiest to break. And it works immediately. So now download and install the trial. Run the program for the first time, and it will say something like, "This is a free trial. Please register to have the full version." Then there's generally a button you can click to register, so click that. A new dialog will show up, displaying a couple text input boxes. This is where the registration key goes and stuff. So far, it's been easy, this next part is where it gets a bit difficult. But hang in there, you can do it! You don't have a key, so you need to get one. There's most likely a link in the dialog to the manufacturer's site. Don't worry, you don't have to pay anything if you don't want to
So just click the link, and it'll take you to the site. Enter your billing info and you're instantly presented with a key.
Cobweb, your sig is dull-witted and juvenile.