You need the new wallet - delete everything in AppData/Fluttercoin EXCEPT (DO NOT DELETE) your wallet.dat and .conf file if you made one. The coins you earned are still possibly good, they'll be verified agains the blockchain in the new wallet and may disappear if they were mined on an incorrect chain.
I however, can't get the new wallet to sync ><
I cant even download it - or google is overwhelmed.
Error 404
This is the same file, I just rehosted it at mediafire for another source. I also had trouble d/l from google but going to the File>Download menu (on the page not on the browser UI) instead of the little dropdown arrow next to the file let me download it. But here ya go if it wont' work:
https://www.mediafire.com/?lhjyi262ea70ksz