Microsoft had launched the Windows 10 officially but before that it had started downloading Windows 10 to those users who had registered for it previously, these files are available on the $Windows BT- with the size of the folder being 3GB.
There are reports that the Windows 10 had started downloading but till yesterday morning there was no confirmation of official installation.
Before the official launching many users had started downloading Windows 10 due to which the Windows server had been heavily loaded and therefore they had started downloading before the official release which meant that if you already had the file folder $Windows BT, then the Windows 10 would be installed on the day of the official release which was on the 29th of July 2015, whereby it has launched its free software in 190 countries.
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