Crex24 will automatically credit the new BTCU coin in 1:10 ratio once listed on 30.11
In order to get your coins it is required to deposit your coins to crex24 before 30.11, so the best would be to deposit them on 29.11 and stake untill than
Regarding old BTCU coin, it will still exist and be available to trade, so my suggestion is to grab 1 sat coins as there is only about 0.65BTC wall
Holders of 15 million plus of old BTCU will get a free masternode