Chaos, thanks, that matches my understanding. (And don't get me started on ancient home routers ....)

So, the options are:

1) Dual boot with Linux, assuming they need files and offline access to installed Win7 software

2) Try the quietly still-available upgrade tool from Microsoft. I used this late last year on four systems. Two were compatible, and are now on Win10. Two were not compatible, but the current installer is quite intelligent and restored them to Win7. Very slick and capable, unlike the initial offering way back when.

for USA
https:// www. microsoft. com/en-us/software-download/windows10

for Canada
https:// www. microsoft. com/en-ca/software-download/windows10

3) Try the PC-to-Chromebook conversion. Said to work, but security is a question mark.