Move the .sga files from the download into the scenarios folder.

The "634 Maps Exclusive" pack for Company of Heroes (CoH) is a legendary community-driven project that grew from a desire to preserve the game's creative history. Steam Community The Origin Story

For users short on space on their primary drive, maps can sometimes be placed in the Steam directory under:

For the legacy/non-Steam version, this is usually located in:

: Many maps in these large community packs have been revised to fix bugs, improve pathing, and ensure the AI functions correctly.