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Only the campaign.sav file is responsible for the campaigns, but if you need other save files as well, you can copy the entire folder.
You can download patch 1.6 here:
http://patches.ubi.com/heroes_might_magic_5/heroes_might_magic_5_1.06_rus_cumulative.exe
and where is this file located?
I only found it here: C:\Documents and Settings\pol\My Documents\My Games\EEPOA 3HEPEAA A BOAAEECTBA V\Profiles\pol\Saves
Is that it?