Both 6.3 and 7 will install into a folder named Daz3D. This is different than 6.1, which installed in a folder simple named Daz.

So most people, found that in order to use 6.3 effectively they had to transfer their presets from the Daz folder to the Daz3D folder. Just to be on the safe side, I always move my User presets to a secure location, for in the past a new installs or mere re-installs would replace occupied User folders with empty ones of the same name.

As far as the beta goes, I think that in order to qualify you must be a Bryce 6.3 user, and they say it is still not too late to upgrade to 6.3.

Good luck.