Unable to upgrade new Windows 10 version if there is insufficient storage space

 Recent Windows 10 cumulative update logs mention Microsoft deploying new telemetry tools. The purpose of these telemetry tools is to help Microsoft check the compatibility of hardware devices. If there are compatibility issues, the system will not automatically upgrade the new version.

The new version here refers to the major version of Windows 10 Version 1809 that will be released, also known as the  Windows 10 October 2018 Update.

There is not enough disk space to upgrade automatically

Microsoft’s latest technology blog has explicitly mentioned that if there is not enough disk space, it will be recorded by the compatibility check tool and then prevent the system from automatically upgrading.

We know that Microsoft’s strategy is to start the system to download and install in the background silently, and then prompt the user or directly restart the installation.

So many users complain that their Windows 10 is always automatically upgraded, but the prerequisite for the automatic upgrade is that the system disk needs to have enough space.

Many users have blocked system updates by copying large files before, and the system cannot update them as long as there is insufficient space.

How much space is needed to update appropriately:

We calculate the amount of space required for the major version update of Windows 10. It is mainly divided into downloading images and backing up old versions of the system.

The image file downloaded is mainly about ESD image and auxiliary file about 5GB, and the old version backup automatically performed by the system is about 20G.

The old version backup of the system is the Windows.old folder. The reason for creating the backup is that the user can perform the rollback operation within ten days after the upgrade.

Then the system free disk cannot complete the download and backup operations if it is less than 25GB, so the compatibility check tool will prevent the system from trying to update.