I just tried now the windows version of the game myself, so you go down to the options you have after clicking travel then you go outside then you click mall then you click on The Devils store literally the only thing you can click on in the mall.
there you can see some items you can buy, I can see yeah you cannot buy a dildo? you can only buy a flute and wine.
but I chose to click continue game even though I haven't played the windows version before, but that's where it should be, if it's also not there for you? then you will yes have to download the game if you want that content