well i guess only LEGAL way to get registration code is to buy the program etc.
besides what’s the ‘registration code’ have anything to do with ‘fixing’ a corrupted .rar file? … if the file’s corrupt im pretty sure having the full WinRAR app aint going to help much.
but generally speaking if u cant afford to lose data in the future… back it up properly OR use QuickPAR ( http://www.quickpar.org.uk/ ) as it’s great at fixing a little data corruption here and there… it generally makes recovery files that are 10percent of the total data size you want to recover.
that wont work in your current situation as you need to make those files BEFORE data corruption happens.