Some versions use a "BizUpdaterPack" or similar client-server tool that automatically downloads and applies the language files.
To change the language of (2010) to English, especially when dealing with specific language packs or repacks, you can use a few different methods ranging from simple registry edits to using a community-made patcher. Method 1: Use the Community Patch (Recommended) blur game english language pack 133
: Typically found in C:\Program Files (x86)\Activision\Blur or your custom install path. blur game english language pack 133