Since .NET 4.5 is an older release, Microsoft has archived the Developer Pack. Use the following official links:
| Problem | Solution | |---------|----------| | | .NET 4.5 is an in-place update. Use Turn Windows features on/off or install .NET 3.5 first if needed. | | Visual Studio doesn’t show 4.5 | Repair Visual Studio installation, then re-run Developer Pack installer. | | Blocked by antivirus | Temporarily disable real-time protection (re-enable after). | | Error: “Product already installed” | Uninstall conflicting .NET SDKs via Control Panel, then retry. | | Missing IntelliSense | Copy %ProgramFiles(x86)%\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\ manually if needed. | microsoft .net framework 4.5 developer pack download
If you aren't sure if you already have the developer pack installed, you can check your Windows Registry: Open regedit.exe . | | Visual Studio doesn’t show 4
If you want, I can (A) locate Microsoft’s current download page(s) for the .NET Framework 4.5 Developer Pack and runtime, or (B) provide step-by-step install instructions for a specific Windows version — tell me which you prefer. microsoft .net framework 4.5 developer pack download