I found this in in the change log.
I am curious if those old instances are pointing to AU/Component 1.0.1 files. If that is the case, are there any download links for Nolly v1.0.1? That way I can uninstall 2.0.0, recover the sessions, backup the presets, install 2.0.0 again, and then have the converted 2.0.0 versions of the presets.