The offline installer is primarily used in environments where internet connectivity is restricted or for large-scale enterprise deployments to save bandwidth.
If you run the web installer ( dotnetfx45_full_x86_x64.exe ) on a fresh Windows 7 SP1 machine today, you will likely receive a network error. The web installer tries to fetch the manifest from a URL that now redirects or requires TLS 1.2—a protocol that Windows 7 doesn’t enable by default without specific patches. net framework 4.5 2 offline installer for windows 7