While not truly "portable," you can install SketchUp Make 2017 on your PC, then use PortableApps.com platform to essentially launder the install. You can carry your user settings, extensions, and projects on a drive, even if the program lives on the host computer.
Most "portable" versions are community-made wrappers that temporarily inject these registry settings when you launch the app and remove them when you close it [27]. Limitation: sketchup 8 portable