FLStudioMobile app from the Windows app store:
You run Windows S at this moment. A free change to a regular Windows version is needed first, before you can install FLStudio from the links above. More ...
I can't get the content library to work in FL12, I have tried downloading and installing it but when I try to open it from FL it just opens < > http://www.image-line.com/content/category/all/ < > in Firefox. ...