Can you help us?

Our bitcoin wallet is empty after I tried to reset it. I initially send some bitcoins tot another adres but the bitcoins were stuck. ( to low or no fee of Not yet possible very old wallet) Only 1 peer viewed them and the transaction was never approved. So I followed Multibt instructions on there internetsite tot reset blockchain an transactions. After I done that my complete wallet was empty. The only thing I see now is the transaction that I bought bitcoins in 2013, but they are not in my wallet anymore. How can I get my bitcoins back? I use an apple laptop and make generaal backups with Time Machine and I use multibit version 0.5.14.  We know its to old.


On bitcoin forums i read the following solution.
1) upgrade the wallet to higher version
2) reset blockchain and transactions

I am not sure this is THE the  solution ?
Of the savest solution...  ? -) not visable coin Total  lose by updating?

Can Someone tell u's the best proceedure?
Unfortunately Multibit is not give u's any answer......


Kind regards,

Wendy