http://p2pool2giz2r5cpqicajwoazjcxkfujxswtk3jolfk2ubilhrkqam2id.onion/miner/49Zk77FFBuDiAnWHdFihK1CsqLwzQtw9AZ2b6hHFstF1V8pj9BZYEeTUCQzzVrHAmCMmodFq8vG1cdJrzCRLsTXbRRnYRMd
If you keep using previous versions, you will keep mining as usual, but become almost a solo miner, as incompatible clients will mine on their own. After the fork, you can check on OLD.P2Pool.Observer . After upgrading to a supported P2Pool version and mining a share, this message will be dismissed.