No. The whole point of the offline installer is that once the files are on your USB or ISO, you never need the internet again.
When searching for "offline installers" on the internet, you will often find third-party websites offering .exe or .zip downloads. Be extremely cautious. Many of these are repackaged installers that may contain malware or bloatware. Important: Do not download random “
The safest method is to use the official Windows ISO file (which contains the necessary files) or the Windows Command Prompt. The guide below uses the official Microsoft DISM tool built into Windows. The progress bar will go from 0% to 100%
Important: Do not download random “.NET 3.5 installer” EXE files from third‑party websites – they may contain malware. Use Microsoft’s official sources (Windows media or the method below). Important: Do not download random “
The progress bar will go from 0% to 100%. Once finished, you will see:
"The operation completed successfully."
Result: .NET Framework 3.5 is permanently installed. No internet required.