Hi i dont find any information abaout Aperture 3 upgrade version. I want to buy this program but I wonder if I can install Aperture 3 Upgrade on my computer without Aperture 2. Can I make clean install without having previously version?
That's certainly how it works with Final Cut Express. I think the OP is asking if, for any reason, he owns Aperture 2 but does not have it installed can he install Aperture 3. I did just this with FCE as I did not have any video sources for quite some time so did not have it installed then just installed the final update and gave it both the update and original serial numbers.
The OP pretty clearly states he doesn't have the previous version. I believe he's asking if you can get away with installing the "upgrade" without having to own the old version, like you can do with the Snow Leopard "upgrade".
The answer is almost certainly "no" - Apple's pro apps check those sorts of things. But I haven't tested it myself, and don't plan to.