Wish to install (again) v.12 on my laptop as well

I've been using Directory Opus for a few years, version 12. All seems to be well, except I went to use my laptop instance a few days ago. Hadn't used it for more than a year and it says my certificate has expired (or some such). Like I need to copy paste this somewhere. Sorry, but I lost my credentials which I normally keep in my contacts notes (my bad). What must I do?
Len

Try the Lost Registration Retrieval form, and if that fails please email support@gpsoft.com.au.