Notepad.File > Open.C:\Windows\System32\drivers\etc\Text Documents (*.txt) to All Files (*.*) .hosts (no extension). Click Open.the hosts file with Notepad: notepad c:\windows\system32\drivers\etc\hosts .
ping download.trimble.com
It should resolve to 127.0.0.1. If so, SketchUp will be unable to reach that domain.