2020 versions of Windows 10 are on more than 80% of PCs now.
Windows 10 OS Worldwide (PCs)
October 2020 Update added another 10% to its share over the month of April and is now on more than 40% of Windows 10 PCs.
Around 70,000 Windows 10 PCs were surveyed.
Windows 10 OS Worldwide History (PCs)
2020 versions of Windows 10 are now on more than 80% of Windows 10 PCs surveyed.
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