Unity Services and older versions of Unity
 I'm using version 2018.3.1f1 Personal and I've been trying to implement IAP into my game; but, each time I import the service and restart the project, all of my scripts are disconnected and I'm getting an error about the Editor. 
 I just can't seem to figure this out. If I update the API, the same thing happens as when I say "No Thanks." Generally, I'm very confused about how to smoothly update Unity without breaking everything; but, all of the tutorials and articles I've read and watched make it seem like it should be a much more smooth process than it has been for me. 
 Any suggestions or references? 
 Many thanks! 
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