Hi Elie,
mSecure 5 is a single one time purchase that gives you access to all the mSecure 5 features on Android, iOS, Mac, and Windows on as many devices as you'd like. mSecure 5's minimum system requirements are iOS 10.3+; Watch OS 4.3+; Android 4.3+; Mac 10.11+; Windows 10 (UWP).
Elie