Hi,

I stopped using Bitcoin a few years ago, back then I had the Bitcoin Core wallet so I just backed up my wallet.dat.

I heard / was told that since then the 'old addresses' are not good anymore and I need to do something like get a new address and transfer the coins from the old address to the new address?

Can you please tell me more about this? what i ned to do? I think last BitCoin core i used was 0.16.0 but that was just an update of the software. The wallet itself was created by an earlier version.

Thanks.