Bumping this. If you wish to find topics about the Desktop Viewer only, it is very difficult.
The viewer category was renamed (after this topic was posted) to be “SketchUp Viewer”.
(It originally was “SketchUp Mobile Viewer”.)
If you go into this category, you see all of it’s top level threads mixed with all of it’s sub-category threads!
There is no way to filter out the mobile viewer sub-category postings in the listing.
This is annoying. And is leading to confusion. Evidence this thread:
SketchUp 2017 Files Won’t Open With Older SketchUp Viewer Versions
It wasn’t clear to begin with which viewer product the OP was talking about. You had to read carefully to realize that she was speaking of the Desktop Viewer. Then near the bottom, a mobile viewer customer started posting about one of the mobile viewer applets in this thread.
Really, it would be better if there was a dedicated “Desktop Viewer” sub-category of the main toplevel viewer category. (This would be where users would go looking for a category and threads re the desktop viewer edition.)