There is a software I would like called "reason" which has upgrades their software to like 6.0, and I was wondering if they would care if i got the torrent for 3.0.. The software 3.0 only cost like $25.00 on ebay and 6.0 cost like $300, so.
Yes they care. Copyright extends for a fixed period (generally 70 years past the death of the author) and cannot be renewed. Trademarks exist for a shorter period (10 or 20 years) but can be renewed indefinitely. If you pay for it, it shouldn't be an issue.
If you're using a pirated version (ie: you're going to use a key generator or you didn't pay for it), then they will care. Any copy or installation of copyrighted software is illegal - not that it stops anyone!