Downloading and installing SketchUp 2016 should not have done anything to previously installed SketchUp versions nor to your models. Every version of SketchUp installs as a separate application. Do a search for *.skp and see what turns up.
Downloading and installing SketchUp 2016 should not have done anything to previously installed SketchUp versions nor to your models. Every version of SketchUp installs as a separate application. Do a search for *.skp and see what turns up.