Q: Cannot update Boot Camp drivers in Windows 10

I have a 27-inch iMac (End 2012) running OS 10.10.5 and Windows 10 in a Parallels Bootcamp partition.

When I tried to update to Windows 10 from Windows 7 using the Windows 10 reservation button, I was told the Parallells Display driver is not supported, so I had to use the Windows 10 Media Creation Tool to run the upgrade.

As recommended by Apple, I then wanted to update the Apple drivers for Windows 10 using the Apple Software Update tool, but it doesn't find any new updates,

I then loaded the latest Boot Camp drivers onto a flash drive using the Boot Camp Assistant, however, I still have version 5.1.4 even though there is apparently now version 6 out which supports Windows 10 even better. But I can't find an upgrade for that.

The Boot Camp drivers are build 6114, but when I try to run the Setup.exe, Windows tells me "This version of Boot Camp cannot be executed on this computer model".

What is the latest build of the Boot Camp drivers? Or how can I upgrade Boot Camp to version 6?