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If you encounter issues during installation, here are some troubleshooting steps:

(Released 2011/2012): A minor runtime patch frequently misidentified by users as "4.3".

: Follow the setup wizard instructions. Even if a restart is not explicitly requested, reboot your machine to force Windows to register the new system environment variables. Verifying Which .NET Version Is Actually Installed

If you are unsure which .NET Framework version is currently installed on your system, you can check the Windows Registry using Command Prompt (CMD) or PowerShell. The Release DWORD value tells you the exact version.

Common Release DWORD values include:

To understand why version 4.3 does not exist, it helps to look at how Microsoft actually updated the .NET Framework 4.x lineage. Every release after version 4.0 was an meaning installing a newer version completely replaces and upgrades the older 4.0 core files while maintaining strict backward compatibility.