Seems plausible...(I'll find out, when I've completed the mandatory reboot)
Microsoft deny all knowledge of Service Pack 6, but CNET have a copy.
There is a post SP6 roll-up here: https://www.microsoft.com/en-gb/download/details.aspx?id=30505
and what is possibly a later version of the same thing (published in 2021!), here: https://www.microsoft.com/en-us/download/details.aspx?id=50722