If I remember correctly what the SketchUp add on did was convert vertical planes to walls, horizontal to slabs and inclined to roof. This could work if you modeled in SU with only planes that had no width. Once you created a BOX for a "wall" then the import became a mess.
The person that indicated that they transported perfectly as before though correct misled on you on the Add-On. If you model in SketchUp then you can import it into AC without any trouble and if you need to edit it you can convert it to a Morph but all the elements will be Morphs not walls, slabs etc.
AFAIK SketchUp does not have dedicated tools for walls, slabs etc and as Lazlo indicated using IFC might help with this but I have not tried it.
AIA NCARBAC26 US/INT -> AC08
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