SketchUP says I am not online when I really am

[DaveR]

The nopt online thing has been addressed here:

SketchUp (desktop version) thinks you don't have an Internet connection

Since about a month ago there has been an increase in the number of forum posts and support requests, where SketchUp is showing a message about how you need to have an Internet connection to do that feature. The features affected would include Add location, Generate Report, 3D Warehouse, and Extension Warehouse. It also would prevent you from being able to add a Classic license, or use an existing Network license. Some extensions may be affected too, if they rely on having an Internet connection…

As for accessing the 3D Warehouse and the Extension Warehouse, you still won’t be able to do that within SketchUp 2018. The warehouses haven’t supported that version for about 4 years. You can access them in your web browser and for the 3D Warehouse you can download the Collada versions of the component files and import their .dae files into SketchUp 2018.