I think we must remake build for actualize checkpoint.
I've done actualized checkpoints and recompiled my wallet.
I sent to "Pull requests" on GitHub the necessary modifications for updated checkpoints,
maybe someone with granted acces will do those modifications in the source.
later edit :
Also, about the wallet message :
"WARNING: Checkpoint is too old. Wait for block chain to download, or notify developers of the issue."
this worked for me : https://github.com/PaycoinFoundation/paycoin/commit/350d63f54697d669d43e6fefa26f37326c658bcc
My wallet looks fine now but i don't have access to modify the source on GitHub, so who can maybe will do it
https://imgur.com/a/1XNbpTill then everyone can do the modifications and recompile their wallet.
However, i can provide Ubuntu wallet : https://mega.nz/#F!4IAXUBQA!dn4DP55KsQjT5ueNCf9o9g