Similar to #4. Seems the commits merged in PR #5 did not take the install location specified in the CMakeLists.txt into account.

AFAIU the current layout of the package will make it work either in the source / devel workspace, or the install workspace (due to present / missing urdf_tutorial/ subdir). I can change the launch files or the CMakeLists.txt, but don't know what the preferred situation is.