Hi Ozdeoz.,
1) Regarding your query, Error establishing a database connection refer to the article http://docs.wedesignthemes.com/dt_articles/requirements-for-theme/ and check the server requirements.
Please refer: https://prnt.sc/KCeFvbWy78Dp
2) Regarding your theme options issue, we are checking the issue. Will get back to you once it is resolved. Due to the server issue, we can’t able to check the issue continuously.
Thanks!!