Ram can be upgraded, It has 4gb that is essentially onboard, and 1 slot that can then be used for additional memory. Mine has 8gb additional memory but with this processor, the standard 4gb or adding an extra 2-4gb should be plenty.
Pentium N5030 I think - specs are on Intel website.
Specs Looks like the RAM can be increased to 8GB and there's a NVMe interface. This info iis from Intel's webpage using model number 'NX.A2MEK.003' taken from the AO eBay page.
You do realise it takes 2 clicks and 30 seconds max to change from Windows S? My son did it by himself when he was 7... 'Windows 10 S is a fully-fledged version of Windows 10'