Have you restarted SketchUp to sync everything ?
Have you installed the SketchUcation Tools needed for licensing ?
Assuming you are using Windows - have you installed Sketchup properly ?
Double-clicking the installer's exe file to 'Run' it is not enough, even if your user account has admin powers - doing so can cause unpredictable issues, often around permissions and file access.
It can be repaired without needing to re-install SketchUp - do the following...
It will leave any installed files etc unaffected...
Close SketchUp.
Find its installer exe file - usually in your Downloads folder [down load a new copy if you no longer have it].
Select the exe file's icon, right-click > context-menu > Run as administrator
When prompted choose Repair.
When it finishes restart SketchUp.
Any improvement ?