Windows 10 20H2 crosses 20%.
Windows 10 OS Worldwide (PCs)
October 2020 Update is on a little over 20% of surveyed PCs now.
Close to 80,000 Windows 10 PCs were surveyed.
Windows 10 OS Worldwide History (PCs)
In February Windows 10 20H2 added around 3% to its share for the second month in a row.
Note: we don't have the data for the initial rollout of the first update to Windows 10 (1511, also known as Threshold 2). So it's a straight line from 0 to the first data point we have on August 22nd, 2016.
Source: AdDuplex Windows Device Statistics reports