Web installers often fail on Windows 7 due to outdated security certificates (SHA-1 vs. SHA-2). The offline package contains all necessary components in one "redistributable" file.
Understanding .NET Framework 4.0.3019 for Windows 7 (32-Bit) net framework 40 3019 windows 7 32 bit offline
Approximately 850 MB for the 32-bit (x86) installation. How to Install .NET Framework 4.0.3019 Offline Web installers often fail on Windows 7 due