In 2008, when Magento was released, it got massive downloads of more than 500,000. It was a huge success at that time, and the numbers have only increased from there. As per the stats of Magento, the platform is getting more than 5000 downloads every day. It makes 150,000 every month. It ultimately implies that the figure which was achieved in 2008 is now achievable within only 3 months.
These numbers only reflect the official website stats while there must be more numbers for 3rd party downloads, and pirated copies. We always recommend not to use any pirated copy as it can contain viruses or malware.