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If you have problems with Windows 10 upgrade through Windows update you can manually download and install Windows 10 (offline mode).
Use this tool ,click the microsoft website link, to download the tool.
After you download the tool, run it select 32 or 64 bit.
You can upgrade directly your operating system (Windows 7 sp1, Windows 8.1), create usb media or download iso for other pc… read more.