V4.1 has many new face morphs that greatly extend your ability to shape the face, and some morphs in other parts of the body.  If you don't design your own character morphs but rather only use canned morphs, then you only benefit from being able to load going-forward DAZ morphs that will rely on the new ExP crap.  This includes the muscle morphs, it seems.

If you aren't hurting for more morphs for V4, then do not upgrade, simply put.  If it ain't broke, don't fix it.  Myself I got the muscle morphs, and ran the updater just for that, and saved a new blank CR2.  The ExP updater is frankly pretty crappy and needs improvement.  I'd expect a V4.2 update eventually (3-6 months) just to give the updater non-suckitude.  It is optionless and inflexible.  While the user can manually fix the things it does, and make the CR2 portable to external runtimes, it could be made much more simple than it is.

Dyret I suggest you contact DAZ tech support if you're having problems with the installer, I didn't have any trouble like that.

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