| Architecture | Use Case | | :--- | :--- | | | The standard for modern PCs (Intel Core i3/i5/i7/i9, AMD Ryzen). Install this unless you are sure you need something else. | | x86 | Legacy 32-bit systems or old applications. Most users today do not need this. | | Arm64 | For Surface Pro X, Lenovo ThinkPad X13s, or Macs running Windows on Parallels (M1/M2/M3). |

Multiple versions are installed (8.0.3, 8.0.4, 8.0.5). Solution: This is safe. .NET supports side-by-side installation. However, you can uninstall older patches via Settings > Apps > Installed apps , leaving only the highest version number. Conclusion The Microsoft .NET Desktop Runtime 8.0 (x64) is not "bloatware" or an optional add-on. It is the modern equivalent of the Visual C++ Redistributable—a foundational layer for thousands of Windows apps.

Installation fails with error 0x80070643. Solution: This is often a corrupted Windows Installer cache. Run the official Microsoft .NET Repair Tool from their GitHub releases.