With WaaS, not everybody gets the code at the same time, as you might expect. Instead, the task of updating more than 800m PCs is spread over many months.

A few million people want the latest version, even if it isn’t finished. They join the “insider ring” of beta testers, who look for bugs before the operating system is released to a broader audience. Some are what Microsoft calls “seekers”: they check manually for updates and install them as soon as they become available.

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Most people ignore new versions until they are reminded to install them. If they are not paying attention – the installation is practically underway.

In general, it’s safer to install milestone updates later rather than sooner. If you upgrade to version 1903 now, you will get a version that has had months of testing, and that has already been installed on hundreds of millions of PCs.

If you wait for the “fall version,” currently called 19H2, then you will get code that hasn’t been as thoroughly debugged. Also, it will be a more significant leap from 1803, and big leaps are inherently riskier than small ones.

You don’t have to be on the current version of Windows 10, where some new features may introduce a few new bugs. However, it’s a bad idea to fall two or three versions behind.

Update problems which you may face during update

The mass upgrade process depends on a lot of machine learning based on feedback from telemetry. The PCs that seem easiest to upgrade correctly are offered updates before the ones that look trickier. As bugs are found and fixed, updates are offered to more and more PCs.

Updates are sometimes suspended for various reasons. It happened to some PCs that had not been patched for the Meltdown and Spectre vulnerabilities. With 1903, some users were put on hold because their PCs were running an outdated Intel Rapid Storage Technology (RST), driver.

In my case, the warning went away, and Microsoft installed a Microsoft driver. For the reader who wasn’t so lucky, it should have been fixed by the KB4512941 update on 30 August.

Update attempts can also fail because your PC does not have enough storage space. You need enough room for the version of Windows that is running, the version you have downloaded, and a security copy of the old version of Windows 10 in case you need to roll back a failed upgrade. This backup is now deleted after about 10 days; it used to be about 30 days.

Windows 10 should upgrade correctly if you plug in an external hard drive – that has worked for me – or provide other storage space. If that doesn’t work, the solution is to download a copy of Windows 10 and the free Media Creation Tool.

Create installation media on a USB memory stick or DVD, then install a new copy of Windows 10. You must back up your data first. Otherwise, you may be able to solve update problems by downloading the Update Assistant.

You can also contact Microsoft support via the “Get help” link on the right-hand side of the Windows Update page in the Settings (cogwheel) app.

I tried it once, got instant help, and it was helpful. The Microsoft Support web page for Windows 10 offers further options including “call me back,” “schedule a call,” and “ask the community” (by posting in the support forum).

Sometimes it helps if you have checked your PC’s telemetry using the Diagnostic Data Viewer app available in the Windows Store. Alternatively, look at the Problem Reports page in the Security and Maintenance section of the old Control Panel, or the Event Viewer.