Unzip your facepack. You will find a folder named something like FM07 Megapack. Inside, there is a config.xml and hundreds of sub-folders (e.g., England\Prem\Arsenal, Spain\La Liga\Barcelona).
Copy the entire contents (the config.xml + the national folders) directly into Football Manager 2007\Graphics\Faces\. football manager 2007 facepack
Do not bury the config file three layers deep. The correct path looks like this:
...\Football Manager 2007\Graphics\Faces\config.xml Unzip your facepack
Installing a facepack for Football Manager 2007 can seem daunting, but it's a straightforward process: football manager 2007 facepack
The definitive FM07 facepack is not a single file but a patchwork of contributions. Analysis of community archives reveals a specific visual canon: