Windows 10 Upgrade for many PCs

I am supposed to upgrade about 70 PCs from Windows 7 to Windows 10 (via the free method of Windows Update). The thing is, that the inteet is slow, and when I am trying to download about 3 Windows 10s at the same time it is very slow, I mean like really slow (a few % of progress every hour).

My question is if there actually is a method to download the installation file just one time and then copy it to all PCs and just type in the License Key of Windows 7 into the Windows 10 installation on every single PC.

Thank you very much.

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