If you downloaded a .cab file from the Microsoft Catalog, you cannot double-click it. Install it via the tool.
If you own Windows 7 Home Premium (the most common edition), you are technically blocked from using official language packs. However, a trusted third-party tool called (developed by a Microsoft MVP) can force language pack installation. Windows 7 English Language Pack Download
Avoid third-party “language pack installer” websites offering standalone EXE files. Many contain malware, adware, or corrupted files. Microsoft officially distributes language packs for Windows 7 only via two channels: If you downloaded a
To summarize the process:
For genuine licensed Windows 7 Ultimate/Enterprise, Microsoft still provides language packs through the legacy update catalog. Windows 7 English Language Pack Download