when working with nlite is it best to start each version with a fresh

[startrekrobs]

when working with nlite is it best to start each version with a fresh copy or to change old version of nlite to a new version?

I guess what I am asking is it best to work from a clean cd install or to upgrade a old install that was done with a old version of nlite?

not sure if this has been asked before

[Jeremy]

New fresh source, always.