The one that they're selling on the store does it work on Windows 10?

Short answer - yes it should (does for me).
Bear in mind - there may be some technical annoyances due to the game's age.

Just making sure...because some of the store pages haven't been updated

for example i got Alone in the Dark: The New Nightmare back in 2015, It didn't work on Widows 10 had issues, Tried it again earlier this year and now it does. So one of the GOG crew has obviously done something to get that one working.