Windows 10 is known for its regular feature updates, meaning a new version of OS is being installed, leaving the old version (which can be found at 'Windows.old' folder) for a possible rollback. The latest feature update 1903 was released in May 2019 and subsequently there was a notification of it on Windows Update:
Start ['Windows' button] > Settings > Update & Security
It also informed that the old Windows version 1803 will be supported until November 2019. As it is the case with Windows 10 Home editions, the updates are eventually being rolled out automatically and by the end of August a Windows notification popped up warning to fix the issue of low disk space. In the meantime Windows Update had had occupied 5GB of storage, going from 10GB to 5GB of free space available. After clearing another 5GB and having again a total of 10GB of free storage, Windows 10 was able to move on with the 1903 feature update.
After downloading and installing the 1903 update, it was time to restart the PC, and after several reboots and update finalisation, the new version of Windows 10 was available for use.
Apart from a few design (background, color, icons) changes, everything seemed to work as normal. The hard drive at this point had 5GB of free space available. The 'Windows.old' folder was occupying 20GB of storage. It was also confirmed via 'Disk Cleanup' utility by having a look at 'Previous Windows installation(s)':
This PC > Right-click on the disk, ex. Windows (C:) > Properties > General [Tab] > Disk Cleanup > Clean up system files
Eventually the 'Disk Cleanup' utility was used to remove the previous version of Windows 10, and now the total of free disk space available was 20GB. So in terms of disk (storage) space requirement for Window 10 1903 update, the actual free hard drive space went from 10GB to 20GB after the update.
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