I tried to install .NET Framework 4.0 on a clean Windows XP SP2 machine. The installation failed. It's the normal behavior.
.NET Framework 4.0 installer checks the bottom line of the minimum requirement during the installation. If any minimum requirement is not met, the installation will fail.
Yes, we have installed the 4.0 .Net Framework, using an executable, on a several machines with windows xp SP2 without any issues. We also are running our application without experiencing any errors, but we still plan additional testing. We have not experienced any installation failures like you mentioned when installing the 4.0 framework on xp sp2.
I've successfully installed .net framework 4 on several XP (32bit) SP2 machines from network installationsetup file (exe) and it has worked fine with the app that requires it. Obviously an unsupported setup but not found any problems - yet! I wonder if the web installer has a block on SP2 but the exe allows it.
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