Another question about DVD Fab Gold

I have DVD Fab Gold (the trail version) in stalled and plan to buy it. Iam on a tight buget and may not be able to get it before the trail runs out.
My question is if the trail run out and I decide to buy it and install the key will it work or will I need to reinstall it?
Hope this is clear.
Thanks Guys…

It should work, it did for me when I bought the 2.### version.