HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

This has been mentioned before, but I can't find how to enable daily autosave?

HD3_Launcher ==> "More options" ==>

EveryDaySaver = 1

SoD/Complete/Hota only
ignored if = 0
0 - option is turned off
1 - option is turned on
default value is 0