If you are part of the Windows Insider program, you have probably wondered why your Windows 10 PC takes a little while to enroll your device into a new ring or the program itself. For instance, if you are in the Slow Ring of the Windows Insider program, once you enroll into the Fast Ring, you won’t get the latest Fast Ring build immediately — instead, it may take your PC up to 24 hours to show the latest build from the Fast Ring. Similarly, you may also not get the latest build from a ring when you enroll your PC into the Insider program for the first time.
We didn’t really know why exactly the Windows Insider program takes 24 hours to process this, but it seems like we finally have an answer. To put it simply: the Windows Insider program does a compatibility check to ensure you get the right build of Windows 10 (using your OS type, SKU, region and language settings). The process can’t be triggered manually, and your PC will only get auto-targeted for the next flight/release once the process is complete.
Here’s how Microsoft describes it:
Once your machine is updated to Windows 10 and you select your desired flight ring, the process known as “Compatibility check” will need to run in the background. There is no manual way to force this process to run. This process allows for the discovery of your OS type (32-bit, 64-bit), build edition (Home, Pro, Enterprise), country and language settings, and other required information. Once this process is complete, your machine will be auto-targeted for the next available flight for your selected ring. For the first build on any given machine, this may take up to 24 hours to complete.
Interestingly enough, this isn’t the case for some Windows 10 devices such as mobile devices where you can get the latest build from a ring as soon as you enroll into that ring.