If you have no USB or ISO at all, you can download the official Windows 10 ISO from Microsoft using another computer (search "Windows 10 media creation tool"), then extract the sources\sxs folder. But never, ever download a standalone "dotnetfx35.exe" from a non-Microsoft site—that's how malware sneaks in.
or a Bootable USB drive (must match your current Windows 10 version/build). Method 1: Installing via DISM (Recommended Method) If you have no USB or ISO at
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How to Download & Install .NET Framework 3.5 on Windows 10 (64-bit) Offline
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.