XPS 13 9360, no Windows update 1809

Hello there!

I do have two questions regarding my XPS 13 9360 and I hope that someone might help me here. The notebook is nearly one year old and I installed windows 10 from a Microsoft ISO instead of the OEM image on the hard drive. DELL update is also installed and works. Right now Windows Update and DELL Update can't find any newer software for my notebook.

• Why is the 'new' 1809 update still not offered? DELL lists this computer compatible to the windows update and I can't find any reason in the MS knowledge base, why the update is being held back.
• Recently, I wondered that there are two entries in the windows apps listing: Dell Update and Dell Update for Windows 10. Is that normal and why is that so?

Thanks for any help,

Sven