If you are upgrading after block 13000, you must download the blockchain again!

1) Download the new wallet from the OP of website
2) locate your support folder for BurnerCoin (windows: %appdata%\BurnerCoin | OSX: /Users/<<>>/Library/Application Support/BurnerCoin )
3) Make a copy of your wallet.dat file
4) Double check you have made a copy of the wallet.dat file and stored it safely elsewhere
5) delete all the files and folders except the wallet.dat file
6) start the new wallet client and wait for the new block chain to sync