A collection of mods and mini-patches for Heroes V!

Eureka! Directly replacing the DefaultStats.xdb file in a2p1-data.pak with the identically named file from the mod worked. I saved the previous version of a2p1-data.pak, just in case I need to revert.

A clumsy way is to mess with the game files.
Download Total Commander, change the mod's extension from h5u to zip, extract it, in Total Commander, select the extracted mod folders, right-click, click "files" (top left corner), then "change attributes," check "process directory contents" and "change dates/times" and "current," click "OK," repack into a zip archive, and change the extension back to h5u.