Hi people! 
I have succeed with [this amazing tutorial][1] to multiply my stairs static mesh by 36 times (the hierarchial instanced static mesh method in blueprints!):
This is how it looks like in the Scripting part in Blueprints:
BUT I don’t know how to multiply these 36 stairs by 18 times and with the angle of 20’ so that they all form a circle like in these pics: (these i did manually so i can show you what I want)
Thank you very much for your time!