If you're looking to Download Road Trip Planner Viewer on your Chromebook laptop Then read the following guideline.

RTP Viewer allows you to view Road Trip Planner files on your Apple device.  Create and edit your files with Road Trip Planner for iOS or OS X, and then anyone can view the files with this app. Road Trip Planner Viewer is free, does not require any subscription and respects your privacy by not collecting any of your data. While you can edit the files with this app, you cannot save your edits. Our iOS app Road Trip Planner at the App Store is virtually identical to this app and allows you to save your edits.   Contact us for more information or bug reports. Multiple sample files are available, including an informative Route 66 sample file. For more info on Road Trip Planner tap or click the Support URL.