Loading private key (missing bitcoin) I exported the private key from a 0.7.2 because I could not how to upgrade the wallet.  I then imported it into 0.18.0 I was expecting to see a  balance and the transactions and nothing was found.  I also searched the blockchain through blockchain.com using the public address from the original wallet and again found nothing.  Would greatly appreciate advice
If you have bitcoins in any address, they should be there unless someone else got access to your wallet and stole them, in which case you should see in a block explorer the corresponding transaction.