Net Framework 45 Developer Pack Link ((exclusive)) May 2026

You can download the Microsoft .NET Framework 4.5 Developer Pack from the official Microsoft website:

. NET Framework 4.5. 2, 4.6, and 4.6. 1 retired on April 26, 2022. Microsoft Learn net framework 45 developer pack link

• Developer Pack vs. Runtime: End users do not need the Developer Pack; they need the .NET Framework runtime. The Developer Pack is exclusively for developer machines and build servers.
• Side-by-side and in-place: .NET Framework 4.5 was an in-place update to .NET 4.0, meaning installing 4.5 replaces some components of 4.0 on a machine; however, the targeting pack allows compilation for 4.5 without necessarily changing runtime behavior of other setups.
• System requirements: Typically requires a supported Windows version at the time of release; always check Microsoft's installation documentation for prerequisites and compatibility with your OS version.
• Security and updates: Even if you must target .NET 4.5, consider updating development and deployment environments to receive security patches; Microsoft later releases (4.5.1, 4.5.2, etc.) included fixes and improvements.

The Developer Pack (also known as the Targeting Pack) is different from the standard runtime:  You can download the Microsoft

Error: “The installer failed with error code 0x80070643”

Cause: Corrupt Windows Installer cache or missing prerequisites. Fix: Developer Pack vs

Error: “The .NET Framework 4.5 is not supported on this operating system”

Cause: You are trying to install on Windows XP or older. .NET 4.5 requires at least Windows Vista SP2, Windows 7 SP1, or Server 2008 R2. Fix: Upgrade your OS or use .NET Framework 4.0 if you are stuck on XP.

Post-Installation Verification

How do you know the Developer Pack is properly installed?

This method is preferred on modern systems.