what can happen if i not update the daemon ? i can use it if i feel confortable with without update ?
This version is obsolete, upgrade req..
You can, but the latest version will have a soft fork, so you should be fine but you won't have access to the features the soft fork enables.
i have a question . how can i encrypt the wallet.dat in centos ?
You can encrypt the wallet using Bitcoin Core's wallet encryption. There should be an option to add a password.
any function for move the wallet.dat in encrypted folder and make the bitcoind use it from the encrypted folder ?
i mean the Blockchain in the standard folder but the wallet.dat in encrypted folder how can i do this ?
It is not possible to move the wallet.dat file to another directory and use it from there. You can however move the entire data directory. If you moved the whole thing into an encrypted folder, as long as the folder is decrypted while you are using it, then Bitcoin core can access that. You just need to start it with some options in the command.
