Trying to transition project from 4.15 to 4.18.1

Followed the recommendations from roman94v here: Here

But apparently this only works for 4.16, The transition guides for 4.18 I’ve found so far are too complicated and I have no knowledge of building or programming.

Is there a way or a simple enough tutorial I can follow to transition a project from 4.15 to 4.18?

Thank you.