As discussed a couple of weeks back, the May 2020 Update to Windows 10 is making its way to users via Windows Update, though not yet all users.
As part of Patch Tuesday this week (9th June), a fix was rolled out (along with lots of other security updates) which should unblock these machines in time. It’s worth proactively going to Updates in your PC’s settings and make sure it has downloaded and installed any and all updates, firmware upgrades and so on. If you have a Surface machine, you can see – and manually download – a list of all the applicable updates, here.
There’s still a compatibility hold which may be active for a few weeks as the Update makes it way to all affected devices. If you’ve applied all the pending changes via Settings -> Update & Security, you can manually kick-off the 2004 upgrade, by going to the Update Assistant page and hitting the Update Now button.
This will download an installer program that will check the PC has the minimum spec, has enough disk space and so on, then it’ll begin the download and install process, which will take a good few minutes to complete, with plenty of downloading / checking / applying etc cycles to complete.
It’s most appropriate, if a little colourful for some, so you’ll need to find it yourself]