Continuing the discussion from SketchUp 2016 is here!:
Does the Finder window look like this by chance?
If so, that’s because Finder is configured on your computer to view hidden files. In this case, you should be able to scroll up in the window to see the SketchUp 2016 folder and the Applications folder. If you don’t want Finder to show hidden files, open a Terminal window and type…
defaults write com.apple.finder AppleShowAllFiles -bool NO
…then restart Finder…
If the installer Finder window doesn’t look like the image I uploaded, feel free to upload a screenshot of what you’re seeing.