SketchUp 2018 Pro - Cannot add License

I got a new laptop and installed SketchUp 2018 Pro again, but I cannot add my license.

I get this message:

" Bummer, It looks like you’re offline.
You must be online to add or remove SketchUp licenses. Please try again next time you are online."

I have tried disabeling my firewall and then tried to add my license, but it didn’t help.

What to do??

Look here: