I was not around. He did it on his own. I'm not that familiar with his setup. He told me that he installed it as Admin. I'm on a mac. As far as Know windows and windows 10 in particular, the Roaming-Folder gets populated at startup time with copies of the Plugins. It seems as if this is not happening. Or am I wrong?

I recommended SketchUp recently to a friend of mine. He bought a Single Licence for SU2017Pro. He installed the german Version from the web, put in the Licence-credentials and it worked fine for his purposes. But the "Extension menu" in the menubar does not show up, instead, he gets this Error Messages:

Fehler beim Laden der Datei (failed to load the File) C:/Users/.../AppData/Roaming/SketchUp/SketchUp 2017/SketchUp/Plugins/su_advancedcameratools/actloader.rbe
Failed to read RBE/RBS file.
Fehler beim Laden der Datei (failed to load the File) C:/Users/.../AppData/Roaming/SketchUp/SketchUp 2017/SketchUp/Plugins/su_dynamiccomponents/ruby/dcloader.rbe
Failed to read RBE/RBS file.
Fehler beim Laden der Datei (failed to load the File) C:/Users/.../AppData/Roaming/SketchUp/SketchUp 2017/SketchUp/Plugins/su_sandbox/sandboxmenus.rbe
Failed to read RBE/RBS file.
...and more…

As I understand, this should not happen. These are genuine SketchUp Plugins? and it happened on a fresh install.
Are there any issues regarding the recent Windows10 Creators update?
or is there something else going on?

Some wisdom will be needed, I guess