Howard Miller

Have you got a plugin (or plugins) in your installation that are not compatible with 4.3? The theme has to be a suspicion. Do all these problems go away if you switch to the core Boost theme?

Failing that, this does sound like some broken javascript is finding its way onto the page. Open the Javascript consold (F12 then the 'Console' tab) and check for red errors when you load a Moodle page.

What do you mean by "at the same time"? Do you mean (for example), 10am and 10,000 all launch the SCORM at the same time?

10,000 is a big number. Make sure you can justify it and that it's not just a "vanity" figure. Getting this wrong will be expensive.

Can you explain (in detail) where the contradictory instructions are? I'd be happy to take a look. I'm not clear as it stands.

EDIT: 

Ahh... spotted what you mean. I changed it so that they are both 'root' (in the 4.3 docs). I think that's "safe" but I would absolutely encourage you to understand the consequences of these choices for whatever hosting/OS you are using. 

In the interests of keeping that page reasonably succinct, I'd be reluctant to get into a "discussion" about this. If you don't know, you can find out or ask. If this gets too long we'll just hit TL;DR

You're probably not going to be surprised by my response...

I don't believe we should "spoon feed" advice like this. We can give general guidance but if you are going to run a live Moodle site on the public Internet then you have some responsibility to know what you are doing. Advice is happily and freely given in these forums but it all depends on your circumstances and requirements.

Even taking somebody through a "click by click" installation for a particular OS isn't much better than just saying "use Softaculous, then". There's more to running a server than getting Moodle to work.

I'm going to stick with my usual advice - do NOT install plugins through the UI on a production server. There are lots of better ways.

The temptation / rookie mistake is to install an untested plugin AND to run the upgrade script without first taking a backup. Both of which might end in tears.