I created MultiBit wallet in 04.2014, exported .key file for backup and kept using the wallet.
In 11.2014 I made a payment and MultiBit generated new address and sent rest of my bitcoin there. I wasn't aware of that and kept using my wallet thinking that my bitcoin is safe.
I upgraded to windows 10 in last august and with my .key file I was able to restore only access to my first address. Which was empty.
So that means there is no way to access the new address? Thanks!
If you have a key file on your computer. it's ok and you can recover your address but if you can not get your key file so you never get your wallet or address again. it mean you lost all your coins. Good luck to you.