Using Ubuntu 16.04LTS:
I simply saved the "Keystore" folder (where all you're wallets are), before doing anything.
Deleted everything related for 0.8.2 (except for "Keystore" folder, which was saved to a temporary location and a USB drive).
Installed 0.8.3 and downloaded the entire bockchain (only takes 40 minutes to download the entire blockchain on Ubuntu 16.04LTS).
Closed 0.8.3 down.
Moved my "Keystore" folder back to hidden Ethereum folder in the Home directory.
Re-ran 0.8.3 and everything was as shinny new

I do re-download the blockchain, when there is a major
mandatory update, as regular routine with all crypto wallets.