I plan to have my students install TeX Live on their laptops (mostly Windows 8 or 10 Pro). If all of them download the packages at the same time, the network will be stalled. I could hand around the TeXLive 2015 iso-image on a USB memory-stick. But, as I recall, installing from the ISO-Image still is a very time consuming process. (The lesson is only 100 minutes)
Is there a better way to do that? The TeX Live guide mentions creating an ISO-image from my up-to-date system, but does not explain how to do so.
If I just copy the C:\texlive tree, what else would I have to do? Update PATH? Regedit?