Need help changing website header

You may lose all your customization if you upgrade to new version as you mentioned it was downloaded several years ago.

Regarding adjusting height of header, you can install custom css plugins like Simple Custom css to override css. after installed that plugin just add the below code on custom css box.

#header #header-inner {
height: 200px;
}

*you can change 200px was you wish.

I still have the MAJOR CONCERN about the custom theme and removal of the string issues, so I’ll repeat my questions below. Thanks Ammu Themes for the code for adjusting the header. Rather than add the plugin, can I achieve the same objective by adding the code to the custom.css file via cpanel/File Manager?

REPEAT OF ORIGINAL REQUESTS FOLLOWS
Several years ago I obtained the Tribune theme (WPZoom) as part of a package from Authority ROI. I was not happy with that theme, so I had a contractor customize it. Since the theme had been customized, I was afraid to apply WPZoom updates. Is that a legitimate concern? Without the updates, can I expect future problems? If so, what kind of problems?

Also, I want to reduce the height of the header in my customized Tribune theme without encroaching on my logo and tagline. I found some code in the Forum that MAY work but I don’t know if it is correct or where to place the code. Please tell me how to make the change and provide the exact code. My test website is testing.laughandheal.com.

Finally, I want to remove the string ‘Authority: ‘ from the tagline. The contractor must have hardcoded the tagline because it does not show in the tagline parameter of the theme. I ran a search of the public_html folder for the string but to no avail. Please tell the file folder or file where I might find the string.
Thank you very much.

Regards,
Steve