Reset your downloads at DAZ. You can do it yourself, from your account history page. Then re-download both the base and the body morph pack.

The morph nickedshield is talking about was made for V3. Not sure how well it would work for SP.

A lot of pose packs are lousy. Including the ones you pay for. There's always a little bit of flattening at the top of the thigh when you bend the legs like that, but it shouldn't be that bad.