I have these build problems when using a (semi obsolete tutorial).
Any idea how I might go about fixing these?
This is my first time working with unity by the way.
You could just delete that MeshCombineUtility.cs, and see if that fixes the main errors.
Maya could not be found means the project contains Autodesk Maya model, but you don’t have it installed…so it wont be able to convert that model, project should work still though…
I managed to fix it after a little troubleshooting. I was able to fix some code where a few functions were used. They were obsolete and I just took a look at the API. 
Thanks for the reply though!