There are localized editions of Windows 10 K and KN for European and Korean market. These editions include all the base features of the Windows 10 but without Windows Media Player and related technologies pre-installed. This is due to anti-monopoly requlations.
MP3 Skype recorder requires some audio libraries installed by default with Windows 10, but not with K and KN editions.
You may need to install Windows Media Player pack manually from Microsoft website if it wasn't installed before.