Microsoft have announced that they will _only_ update windows systems from Nov 2015 or the Anniversary update rolled out last year. If you upgraded to W10 but did not upgrade to the later versions, then you will stop receiving updates. In fact people on W8.1 will be better off than anyone on the first release of W10 who is trapped there.
I managed to get the Anniversary update on Mrs S' tablet, but it took some of my deeper technical skills and I had to circumvent chunks of Microsoft's own OS to gain enough space. You just can't add space to a 32 gig tablet.
Really this is a heads up for anyone who's system is stuck trying to do updates, because if it's not fixed now, they could wind up being blocked without doing a full update with a download from Microsoft which would be very manual.