first of all, it would be better to open separate questions for the different topics instead of putting all things together...
Concerning the license model, let me refer to our website about the different license models of Embedded Wizard Studio.
Concerning the error message "External loder could not be parsed" - it is not clear where this message appears. Is it within Embedded Wizard Studio, does it appear on the target?
Concerning a custom specific touch driver - yes you can adapt ew_bsp_touch.c to access ft5426 instead of ft5336 - or you take the touch driver code from another board that is identical to your hardware. It is the goal of ew_bsp_touch.c to provide a uniform interface independent from the underlying touch hardware.
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