It sounds like the volume serial number (VSN) must be stored with the registration information in one of the files you copied over. If this is true, then we could package that file (once we determine what it is) with a script. The script could install the file and prompt whether it may change the user's VSN to register the plugins. Yes, it's a hack, but it's better than nothing until Authinx can get registration back online for real. AFAIK, the volume serial number was only used for MS-DOS to determine whether a particular disk was inserted. Windows uses a separate disk signature rather than the VSN for that purpose, so nothing should break there. It's possible, though, that other software on the computer uses the VSN for registration, so changing the VSN could break registration for those apps. With that in mind, it would be nice to be able to back up the original VSN and restore it if necessary (i.e. "uninstall" the registration hack).
I no longer have a registered AHP installation so I'm currently unable to test/develop this, but if someone with an installation of AHP with all the plugins registered can send me their AHP files and volume serial number, I could probably do it.