The fastest way to get the upgrade is through Media creation tool or ISO file.
Please download Media Creation Tool from the link below and select Upgrade this PC at the first screen:
This will save your files and apps while bringing you up to the latest version by the most stable method. It will also bring all of your Updates current and solve most problems since it reinstalls Windows.
The only public download on microsoft.com is the latest version.
Other options may be the volume licensing center or via visual studio subscription downloads (assuming you have access).
If you insist on using the old version, you can try the following methods:
Microsoft no long offer the links to get earlier released versions, even though the ISO is still on their servers. You can use Option Six in this tutorial to get the ISO direct from the following link:
Download Windows 10 ISO File
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
Hope above information can help you.
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