So I saw the official response given by Reallusion for this issue. https://kb.reallusion.com/Product/53075/My-model-does-not-appear-for-the-last-step-in-AccuRIG-and-its-stuck-at-60-completion. But I reinstalled AccuRig and it still has the same issue with a particular model. The model is "rigged" but invisible when watching the animation and remainstuck if you try to export it. Did anyone solve this? Must AccurRig be installed somewhere specific?