MANDATORY Release v0.4.5.6 fork(s) soft fork Wed, 14 May 2014 12:00:00  & hard fork Block 57,000
https://github.com/thekidcoin/fluttercoin/releases/tag/v0.4.5.6-flt

Changes:

-Proof of transaction v2
-Checkpoints
 
Windows
Zip https://github.com/thekidcoin/fluttercoin/releases/download/v0.4.5.6-flt/fluttercoin-0.4.5.6-windows.zip
GPG Sig https://github.com/thekidcoin/fluttercoin/releases/download/v0.4.5.6-flt/fluttercoin-0.4.5.6-windows.zip.asc
SHA256SUM https://github.com/thekidcoin/fluttercoin/releases/download/v0.4.5.6-flt/fluttercoin-0.4.5.6-windows.zip.sha256

Linux
Tar https://github.com/thekidcoin/fluttercoin/releases/download/v0.4.5.6-flt/fluttercoin-0.4.5.6-linux.tar
GPG https://github.com/thekidcoin/fluttercoin/releases/download/v0.4.5.6-flt/fluttercoin-0.4.5.6-linux.tar.asc
SHA256SUM https://github.com/thekidcoin/fluttercoin/releases/download/v0.4.5.6-flt/fluttercoin-0.4.5.6-linux.tar.sha256

OSX
Coming Soon