G'Day TM,
I am the possessor of a registered copy of Noteworthy Composer
Sorry mate, but we aren't the ones you need to convince...
According to the "rules" - see the link at the top of the reply text window - enquiries:
- about ordering or registration (which should be sent directly to us, not posted in the forum)
Where "us" is support@noteworthysoftware.com
faq #99 has some hints on getting the best results from your email enquiry as well as a link to the support email address.
I believe the official way out of your dilemma is replacement parts but you should check with support.
As an aside, you cannot install NWC2 without your NWC1.75 CD as the install requires files from it.