Yes, absolutely. .NET Framework 2.0/3.5 and 4. x are completely different runtime environments. They load into different processes and do not interfere with each other. You can, and often do, have .NET 3.5, .NET 4.8, and .NET 6+ all installed on the same machine.
If your target machine is completely offline or air-gapped, you can install the framework using the Deployment Image Servicing and Management (DISM) tool. For this method, you will need the original Windows installation media (USB or ISO file) corresponding to your current OS version. Step-by-Step DISM Deployment
without an active internet connection, you actually only need specific package. net framework 2.0 and 3.0 offline installer
Installing .NET Framework 3.5 automatically installs versions 2.0 and 3.0 on your system. You do not need to look for three separate installation files. Method 1: Enable via Windows Features (Internet Required)
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Browse and select your Windows installation media folder ( sources\sxs ).
While you can run the standalone executable above, modern Windows has a built-in mechanism to install these legacy versions, which is often more reliable. They load into different processes and do not
This often occurs when Windows cannot find the source files. You may need to use a Windows 10/11 ISO file to install it via Command Prompt (using DISM ).