Hi Denise I can't tell for sure what you're on since we have Pro Plus on both Gen3 and Gen4 but they are different...
If you are on a Legacy (older) plan and have a daily download allowance, I think the most we can do is give you tokens, but please do expect your download will cause you to exceed your daily allowance and is probably best run overnight because it will take a very long time.
I appreciate them giving the data for one upgrade. Since they are laptops I would take the other two to the library or some other hotspot. There are also ways to create an installation DVD from the first laptop you install it to. I would recommend doing it anyway since then you'll have it in case of future system crash.
Jezra you and I have the same problem we use Linux. Even though it is the best OS ever and something like 60 to 70% of all servers use Unix(Linux) or Apache2 and it is the 3rd most used OS in the World. Also Europe and Asia use Linux over Windows I think last I read it was by a 3 to 1 margin the sheeple in the US haven't figured out there is life after Windows. If the software and hardware companies would get off the Windows band wagon things could be different. I look for MS to get people updated to Windows 10 then put everything on the Cloud and charge for services and apps like cellular companies do.