Dot Net Framework 3.5 For Windows 8.1 64 Bit Offline Installer -

This method uses the files already present in your Windows 8.1 setup media, located in the sources\sxs

In conclusion, downloading and installing .NET Framework 3.5 on Windows 8.1 64-bit using an offline installer is a straightforward process. By following the steps outlined in this article, you should be able to successfully install .NET Framework 3.5 and run applications that require this version of the framework. If you encounter any issues during the installation process, refer to the troubleshooting steps provided. This method uses the files already present in your Windows 8

.NET 4.x and 3.5 are different runtime environments. Many older apps explicitly check for version 3.5. You can (and should) install both side-by-side. located in the sources\sxs In conclusion