Propably optiminer has not upgrade to V.4 wallet!Can someone transfer hodls from V.3 wallet to V.4 wallet?I mean one V.3 wallet running on a pc and another V.4 wallet running on another pc in another location.
Yes, you can copy wallet from v3 and paste to v4( it will ask you do you want to replace wallet.dat) I presume that you ask for windows?
Default location for wallet is C:\Users\User\AppData\Roaming\HOdlcoin