I recently bought the Acer TravelMate P658-MG-74QM. According to the shop and to the Acer website it has "Windows 7 Professional (available through downgrade rights from Windows 10 Pro)".
Despite the quick setup card showing W10 pictures and the W10 sticker on the laptop, it loaded Windows 7 when I started it for the very first time.
Now I am interested in what is the propper way to upgrade to Windows 10?
Interestingly the SSDs have two recovery partitions: One with 1 GB and another one with 30 GB. So any chance that Windows 10 is already installed and I only need to switch?