AdDuplex released its monthly Windows 10 usage report today, which is based on about 5,000 Microsoft Store apps that use AdDuplex SDK v.2 and higher. The data was collected on July 25.
Interestingly, not a lot has changed in terms of Windows 10 usage since last month's report. Windows 10 version 1803 still represents the majority of Windows 10 PCs, although at 53.7% instead of 58%. The October 2018 Update saw a very modest decline from 30% to 29.7%. The May 2019 Update grew from 6.3% to 11.4%.
It's worth noting that for those on version 1803, Microsoft has started pushing 1903 as an automatic update, which is why 1803 declined as much as it did. It should decline even further next month.
Other versions saw modest drops as well. The Fall creators Update fell from 2.5% to 2.4%, the Creators Update and older fell from 2.9% to 2.7%, and 0.2% are still Insiders.
We can see that the Windows 10 May 2019 Update is off to a slow start when compared to previous updates, with the exception of version 1809. This is due to the way that version 1903 was rolled out. Rather than automatically installing it on users' machines, you'll now get an option to download and install the update, an option that clearly isn't being used by many users.