Download Net Framework 3.5 Windows 10 64 Bit Offline Installer Online
Wait for the process to reach 100%. You should see the message: "The operation completed successfully."
Restart your computer.
While not natively supported, this method can work on Windows 10, though it requires a workaround. Wait for the process to reach 100%
Run the Setup:
Navigate to the extracted folder and run the setup inside the wcu folder. Note that Windows 10 may still attempt to download some components via Windows Update to replace older files during installation. Restart your computer
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs
(Replace D: with your mounted ISO drive letter) While not natively supported, this method can work
Prepared for: System Administrators and Advanced Users
Date: Current
Subject: Sourcing and deploying .NET Framework 3.5 (includes 2.0 & 3.0) without an internet connection.