15 (Beta 2) This version supports Windows 10 only. 13 Asio4All is simply a generic ASIO driver for soundcards that don't have their own low-level drivers to allow for a more low-latency operation.
I have no idea why you were able to select Focusrite Control as the output device in FL Studio, as far as I was aware this is not possible and Focusrite USB ASIO is the correct driver to select. Studio One 3 doesn't circumvent all the issues either sadly.
you can find the files if FL ASIO in the folder of your pc where you have installed FL Studio 'C:\Program Files (x86)\Image-Line\FL Studio ASIO' (or) you can open the downloaded trial installer (flstudio_win_20. Just selecting the ASIO4ALL audio driver will be sufficient for your production needs! Focusrite Scarlett 2i2 (3rd Gen) This USB audio interface for FL Studio features two mic preamps that perform at top levels.
