Thank you for getting me out of this.
I’m indeed reinstalling ePic on my original machine at the moment. Since it’s a new system reinstalled from zilch, I would definitely unregister the previous one and restart from scratches – i.e.: I welcome forthcoming online support allowing us to unlink existing devices all by ourselves.
Thanks again for the explanations. You allowed me to reorganize my installations of ePic in order to be more suited to your registration system.