Right-click the .exe file and select "Run as Administrator."
Ensure your OS is compatible. Note that version 4.5 was a "highly compatible, in-place update" to version 4.0.
If Visual Studio doesn't show 4.5 in the target dropdown, ensure the Multi-Targeting Pack was included in your download. microsoft .net framework 4.5 developer pack download
If you are developing new applications, it is highly recommended to use Microsoft .NET 8.0 or Microsoft .NET Framework 4.8.1 , which are modern and actively supported. How to Check Your Current Version
Once finished, open your project properties in Visual Studio to select ".NET Framework 4.5" as your target. Important Lifecycle and Security Notice Right-click the
Continued use of 4.5 may expose your environment to vulnerabilities that are no longer patched.
Informs Visual Studio about the specific APIs available in version 4.5. If you are developing new applications, it is
The core engine required to execute .NET applications.
Provides tools, compilers, and libraries for building apps. Download and Installation Guide Official Source Microsoft Download Center Supported OS Windows 7 SP1, Windows 8, Windows Server 2008 R2 SP1, 2012 Visual Studio Version Recommended for Visual Studio 2012 and later Step-by-Step Installation
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