Habmin graph charts

Setup, Configuration and Use Beginners
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Tutorials here.
You will need persistence like MySQL

The part with manually downloaded files? Why that? Install HABMIN via PaperUI and it should work.

Also you have to two Topics in one here.

  1. openHAB /HABMIN Charts, persistence
  2. openHAB CLOUD Offline

You should take a step back.
Install HABMIN via PaperUI, follow the tutorial for MySQL
Here is the general User Manual