I purchased a licensed copy of dMC-R16.5 reference on 15th Oct 2018. But I cant remember email used to purchase this and do not have a copy of order number. I have had 2 previous emails and can find these orders. But i'm unable to discover 16.5 order. I still have downloaded installer for it and perfect tunes which was also purchased

How do I recover my licences copy so I can update to latest version?

Thanks for any help.