Extract files blk00000.dat and blk00001.dat to blocks folder (default C:\Users\username\AppData\Roaming\HOdlcoin\blocks, short link %appdata%\HOdlcoin\blocks, in Linux hidden folder ~/.hodlcoin/blocks).
Overwrite old files.
Run command: hodlcoin-qt.exe -reindex 
In linux: ./hodlcoin-qt -reindex