Do you have access to a database of all the ones who took part in the kickstarterprogramm?
It would be probably a good idea to mail them a little headsup mail, things are progressing etc. Maybe some of them saw the anouncement thar this project gets cancelled and now need to know that things sorted out...
Tbh i dont know what account i used back then and if i would receive such a mail i would know my data still exists.
I dont mind paying another copy but at least knowing what mailaddy kickstarter would mail to, could help reactivate the account :D