An Adobe Fireworks trial

Ok.. So here is the series of events. I downloaded an older version of Adobe Fireworks that was offered to me over the internet. After trying it out a couple of days I realized that it probably wasn't exactly legal for me to do so, even though it was an older version.(I never actually activated, or whatever it's called, even though I did have the key) I still don't know if it really was illegal or not(don't things like that sometimes come with more then one lisence?) but I uninstalled it anyway. Then I went to try to download a trial version of the newest Fireworks from the Adobe website because I wanted to try it out. I selected Vista and all, saved(not run), and then tried to run it from my computer. I got an error message. I went back to the Adobe website, looked for information on the error message, and it said to try to download it again and save it(I did this the first time). So I did it again and it downloaded fine.

Now when I go to actually install it I get another error message. I went back to the Adobe website once again, looked up the error message, and I found this: http://kb.adobe.com/selfservice/viewContent.do?externalId=kb401521

My questions are these
1. In your opinion do you think there are any risks in following the instructions it gives? Seems like an aweful lot of trouble to go through to get a trial version, but I do really want to try it out. Now, I'm not a totally computer illiterate person, but I am very cautious(especially considering this isn't my computer) and I'm not afraid to ask questions when I'm not 100% sure I know what I'm doing. I'm also not exactly sure how to follow those instructions. I'm sure I could figure it out, but I'd rather not go through and trial and error.
2. Since I haven't actually downloaded anything, it would be ok to just delete the files that were downloaded without any problems, right? I know that if I had installed it I shouldn't just delete files, right? But since the files have just been downloaded but nothing installed it should be fine, if I decide not to install?

 

I meant, since I haven't installed it can I just delete the files? If the install worked then I would need to uninstall, but I haven't installed, I've only downloaded the files. So it would be ok to just delete them?

The error message reads as follows:

Setup has encountered an error and cannot continue. Contact Adobe Custom Support for assistance.

Internal Error 2739


The full version that I installed previously was uninstalled prior to downloading the trial version from the Adobe website. It was uninstalled through Uninstall or Change a program in the Vista control panel.