First, a quick note on version numbers: The last major stable release of the Blitzkrieg mod is v5.2.0 (sometimes listed as 5.2). There is no official "52.0" – this is almost certainly a typo. This guide assumes you want the widely played v5.2.0.

in Steam, selecting Properties, and entering -mod Blitzkrieg -dev -nomovies in the Launch Options. Key Features in Patch 5.2.0 Is Blitzkrieg BETTER than Company of Heroes 3?

v5.2.0 is considered the most polished and stable version before the development shifted to newer, experimental versions.

If you are using a non-Steam version or prefer manual control, you can find files on community sites, though this is not recommended for the 5.2.0 version due to stability issues: