Upgrade to 4.11

[Debbi]

When I first started Karaoke with the computer (from my discs), I had soooo many problems, so I played it safe for the past year or so with Hoster 3.321 (if it ain't broke, don't fix it...some would say)...however, I want to make a new songbook with 2 columns and I'm thinking it's time to catch up!
If I want to go from my current 3.321 to the new 4.11....First I guess I'll have to purchase at the total price, but then do I start over from scratch (un-install 3.321)? Or do I upgrade right from the 3.321? How does that work?