Microsoft downloads the Windows 10 installation files to computers that use Windows 7, 8, and 8.1 without the permission of their owners. 
So even if the users didn't request the upgrade with the free tool the company released on June 1, Microsoft's new operating system will be downloaded to all PCs, taking up to 6GB of space, depending on the version of Windows.
A publication by the British website Inquirer reveals that several users running genuine versions of Windows 7, 8 or 8.1 who are eligible for the free upgrade in Windows 10, they got the installation files of the new operating system on their PC, even if they didn't want it.
All files are stored in the Windows ~ BT temporary folder created by Microsoft to download the Windows 10 installation files.
Most users claim that the change this happened on Tuesday, when Microsoft released Patch Tuesday, with updates and security fixes for its software.
When the company was asked, it stated that the settings for all consumers actually allow the downloading of the necessary files to install Window 10.
"People who have chosen to receive automatic updates through Windows Update will receive the Windows preparation and installation files they need if they decide to upgrade. When the upgrade is ready, you will be prompted to install Windows 10 on your device. ”
Microsoft trying to catch the target of one billion Window 10 installations up to 2017 is totally abusive, which is definitely the wrong way.
