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since I have the time I'll go through what all I did to try and remedy it. I re-downloaded through the collab button, relinked, reimported(many...
I also can go deeper C:\project\Library\Collab\Download\Library\Collab\Merge
I'm on 2018.2.10f1 and having the same issue, the collab is downloading too \Library\Collab\Download\ but not moving to the main directory....