Contacting everyone who made a donation since the start of C2 offering a refund or licenses is a completely fair thing to do. If anyone who donated before this period of time feels particularly hard done by for some reason, you can PM either me or Ash and we will try and resolve your issue as best we can.
This doesn't take away from the huge appreciation we have for anyone that has donated anything to this site, whether it is their time, code, their tutorials, their moderation, their support questions, artwork, anything! We really do appreciate it and hope you continue to stay with us and help grow the community.