I have your ERC and Pose Helper.
The problem is I have no idea what they do.
The description was vague and the instructions weren’t very helpful.
When I used the Pose Helper, all it did was freeze up Carrara, but not actually help with the Pose.
Reagrding Pose Helper, try selecting a bone further down the hierarchy (for example “chest”). I think if you select the character at the top level and call Pose Helper, that is what crashes it. The default parameters are set up to mirror the pose.
ERC is very powerful and well worth getting to know if you do much animation. It basically sets up a relationship between one parameter and another (or many others). As an example, you can link the biceps morph to the angle of the forearm, so that the muscle flexes automatically. Or moving one aileron on an aircraft can move the aileron on the opposite wing in the opposite direction (as would happen in real life).
I have to admit that actually setting these things up takes a bit of learning and trial and error, but the effects can be fantastic. You can also use a time delay between movements and there is a good example of this to animate a lizard’s tail which you can download at ShareCG.com.