Thank you for your answer.
I don't have access to old pc and I don't remember the old version..
How to know if the old one was an hd wallet? I'm now using the latest version and I can't find anything about that.
If you look at the bottom right corner of the Bitcoin Core window, do you see the HD icon?
If you do, it is an HD wallet... If you don't, it's an "old style" keystore wallet.
Also, an HD wallet will return "hdmasterkeyid" when you use the "getwalletinfo"...