The Windows 8 or 8.1 installation data is doing no harm by staying on your PC, other than taking up space. Deleting this data is safe and will recover a significant amount of hard drive space while you’re at it.
This data is hidden, so users have to navigate through some hidden folders to find it.
If for some reason you downloaded the Windows 8 or 8.1 installation data but never went through with the upgrade or install, you can delete the data from your PC.
