I installed SketchUp viewer in my iPad, but i don’t get a screen to create a new project (so a screen where i can create a space with its measures. This must be a stupid question…
The viewer app is just for viewing. If you want to make a model that you can then use in the viewer, you can go to the web version of SketchUp. It works reasonably well in Chrome on iPad:
Sign in with the same email in both places, and after you have made a model and saved it, come back to the viewer app and touch the cloud icon in the upper right. The models you have made will be in the Trimble Connect area.
Thanks for your quick answer; I succeeded now!