For windows only.
Backup the wallet.dat file. IF this is backed up already on USB stick then you skip this step.
You can find this by doing. Open up run command (Windows key + R)
Type in box and press enter
%appdata%
When this opens you will have a folder in there called redcoin (If you cant see these folders they are hidden . You need to change the folders settings to view system files. Google will help you)
Inside this folder is the wallet.dat (This holds the information and coins) Copy this somewhere safe.
Now delete this folder completely.
Uninstall the wallet application from the control panel.
Install the new wallet with the new .exe
Open wallet and let it sync completely.
Close wallet.
Go back and get to the %appdata% folder.
You will now see a new redcoin folder with a new wallet.dat file
Now copy your backed up wallet file into this folder and overwrite it.
Open wallet it should show the coins.
this does not work - i let the wallet fully sync, deleted new wallet.dat and restored backup wallet.dat and I get an error straight away
Assertion Failed! Expression: mapBlockIndex.count(hashSyncCheckPoint)
I had the exact same problem. The App does not need to be reinstalled, although taking advantage of the opportunity to upgrade to the latest 1.3.1 from
www.redcoin.com is good practice. The error is something associates with the block chain state cached locally. As per the above, delete everything in the Reddcoin application data folder (I deleted the blocks, chainstate, database and txleveldb folders) but leave wallet.dat (with a safe copy elsewhere just in case). Restart the wallet application and it comes up with your coins shown as unconfirmed and starts syncing with the network, as mine currently is. I'm assuming that it will resync and everything go back to normal. I'll report back if there are any more problems, but otherwise please assume this fix worked fine.
Just to confirm the above procedure worked - the Reddcoin wallet resynced with zero balance, I closed the app, copied by backup copy of wallet.dat into "appdata"/Reddcoin, restarted the app, and all back to normal. So to conform the error was the locally cached block chain data consistency or the indexing thereof, so restarting from scratch then overlaying your original wallet.dat file fixes everything.
But this highlights the point that a modicum of technical ability is still needed to work with local wallets. We really need secure hosted wallets like a BlockChain equivalent for any alt coin to really cross over into the mainstream. The world already moved from C: to Cloud anyway, so how will all the alts do this. Forking QT is not the answer.