OK, as far as I know the cap issue is corrected.
Yes, your gallery at http://davebreen.com/jhbsocber20.html now displays correctly. If you do not see your gallery at this address, then please completely clear your browser's cache before reloading your gallery's web page to ensure that your browser is fetching the current files from your web server (and not using older, cached versions from your computer's hard drive).
(The gallery is working so if you do not see it, the issue if most likely a browser caching issue.)
I read somewhere about updating PHP (I don't know what that is), and BlueHost indicated I was using 7.0 which was deprecated, so I updated to 7.3.
PHP is a server-side scripting language. Some web pages may contain PHP code. The PHP code is processed on your web server before the web page is delivered to the user's browser. This allows for a dynamic (rather than just a static) website.
If any of your web pages use PHP, then you'll need to have PHP installed on your web server.
For example, WordPress is a PHP web application which requires PHP. It will not work without PHP.
Juicebox-Pro requires PHP for two functions, namely the Download Button and Password Protection. PHP 5.2 or later is required for these functions but, if you do not use them, then your Juicebox gallery will run quite happily without PHP being available.
When I enter davebreen.com/jhbsocatl20.html I get a WordPress "coming soon" page.
When you visit any URL which does not exist on your web server, your web server defaults to displaying the "WordPress Coming Soon" page as your site's error 404 (file not found) page. You can change this error 404 page if you like but you'll need to find out where it is being set on your web server. (Your web host should be able to help you out with this.)
I did install WP in case I needed it, but have not created any pages in it.
WordPress is a PHP web application which allows users to create a website or blog online in a web browser interface.
You do not need WordPress installed in order to have Juicebox galleries on your website.
However, if you do use WordPress, then there is a dedicated Juicebox plugin for WordPress (WP-Juicebox) which allows you to create and embed galleries into WordPress pages and posts from within the WordPress interface (without having to build your galleries on your computer with JuiceboxBuilder).
If you do not want to use WordPress for your website, then there is absolutely no need for it in order to have Juicebox galleries.
I don't know how to uninstall it.
If you installed WordPress through your online hosting account's control panel, then there may be a way to uninstall it through the control panel, too. I'd investigate this first (ask your web host, they'll know) before you start manually deleting any files.
I don't find a way to disable caching, but have not contact BH yet.
From what I've seen of your website and the changes you've made, I do not see any evidence of server-side caching but if you make any changes and don't see them immediately, then it's just something to bear in mind which might be causing the problem.
The necessary files seem to be in place, so I have no idea why it isn't working.
As I mentioned above, your http://davebreen.com/jhbsocber20.html gallery is now displaying and functioning fine and if you don't see it yourself, then please try clearing your browser's cache before reloading your gallery's web page.
I hope my notes above help to clarify a few things.
If you are having trouble with any other galleries, just post links to them and I'll try to help further.