Dear All,
Managed to get the installed working code of V5.1 from the Hard drive itself. You need a USB to EIDE adaptor so that you can browse the d8b software.
OPEN the system5 folder, then click on drivers then on the rs422 folder. The file is called rs422.key
Open it with a notepad and you get your installed V5.1 working code . The same can be done to all other plugins in the plugin folder. If you have a working code for that particular plugin you will find it in the plugin folder with the extension .key (e.g.finalmix.key....open with notepad and you will get the code)
Another conquered step
NB:
It seems that the MackieOS V5.1 code is calling for the rs422.dll in order to make you authorize the software. This call does not happen in MackieOS3. Maybe the software gurus out there can have a look at this.