A:Answer Yes, a SATA SSD can be swapped out with the pre-installed drive. As the case appears to only support one hard drive by design, you could mount the SSD to the back of the hard drive enclosure without case modification (if you're creative, and assuming you want to retain the pre-installed 1 TB drive). Alternatively, there appears to be a 5.25" expansion bay next to the optical drive that's open. As the case front does not have an opening to make this enclosure useful, you could buy a 2.5 / 3.5 to 5.25" hard drive bracket to store a secondary or third hard drive there. With regard to SATA ports, there are many - so you're good to go there.
As for upgrading to Windows 10 Pro, that should be possible through Microsoft. See https://support.microsoft.com/en-us/help/12384/windows-10-upgrading-home-to-pro for instruction.
