is the official standalone installer filename for Adobe Reader XI (Version 11.0.10) , the English language edition for Windows. The "free" aspect refers to its status as freeware, allowing anyone to download, open, and print PDF documents without a paid subscription.

: Originally designed for Windows, including Windows 7 (32-bit and 64-bit). : English (US). community.adobe.com Installation & Troubleshooting Notes Update Reader 11.0.23 to "what"? And how? - Adobe Community

The file adberdr11010enusexe is for the , not the paid Pro version.