Was not fixed before the free Windows 10 upgrade offer expired - perhaps just as well
Well, this Samsung laptop/Broadcom wifi card/Windows 10 upgrade issue never was resolved before the free Windows 10 upgrade offer expired :(
However, perhaps that is just as well. I worked around the problem by replacing the offending Broadcom wifi card (it has to be removed*) but my fairly high spec. Samsung RC710 laptop (c. 2011) struggles to run Windows 10 - which is a resource hog! Talk about bloatware. I have doubled the RAM from 4GB to 8GB which helped but not much. I will need to replace the harddrive with an expensive, fast SSD drive or cheaper SSHD to get this laptop back into a usable condition.
Windows 10 is not as stable or reliable and Windows 7 yet. It feels like the UI has been vandalized/randomized.
*More information (lots more information) on this issue here:
http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_install/i-can-not-install-windows-10-on-a-laptop-samsung/8ea46dea-b77f-42f7-b22f-6fcdfe080b26?page=1