I've withdrawn the 0.16.3 release and deleted the repository as it's clear that supporting this particular upgrade is beyond my skillset.
Hi Graham,
I've done the protocol upgrade on another network from 0.8 through 0.14.3.
This should be something we can collaborate on to complete for Datacoin in time to bring 0.16.3 or whatever you like.
From what I remember, the last Bitcoin protocol upgrade was the August, 2017 upgrade which was brought in by 0.14.2 and then there was the lil fix to make 0.14.3.
It would make sense the can be no relay of TX between old 0.8 nodes and anything which requires BIP 66.
Best Regards,
-Chicago