You were supposed to be able to convert for free. What happened?
>>What happened?<<
Misogyny, silly!
That aside, I don’t know. Later Best Buy (where I bought the replacement — better and cheaper BTW) said they have a free upgrade to Pro option.
It all worked out OK. All the new non-Apple devices are standardizing on USB-C (including the new HP Spectre laptop which has normal and USB-C). Except the Surface series.
I have the older Surface before MS went nuts and live it but the one USB and DisplayPort only are a small PIA.
Note: I have seen Win 10S compared to Windows RT. Wrong, It is worse (and dumber) than Windows ME!
That was a short-term marketing "loss-leader" offer. For some machines upgrading was $50 for a while, I think. "Butt Now You Vil Pay!"