also the new wallet is available for download, version 1.0.1 https://github.com/segwit/atbcoin/releases
Is there manual, how to update to new version ?
Firstly you should remove the old version of wallet from your computer and install version 1.0.1 you can find the latest version
HEREDo I need to backup old wallet somehow?
My concern is, not to lose all coins, which I have now.