HP Prime APP Windows Store

[StephenG1CMZ]

I am confused.
The Windows App store says the HP Prime App All is $ 19.99 and works on Windows 8 and 10 and
" works on: PC".

Does this mean the "App" doesn't work on Windows 10 tablets, despite being listed in the App store?
Does this mean HP are now charging for PC versions?

Also, when can I expect to see the price in £ ?
My spell checker insists it is an All not an A p p, sorry