I downloaded the smaller french KALite package, and then the install script (sudo ./ finish_install.sh) and then the language pack (english) from the KA lite admin page. That all worked. The KA Lite practice files worked, but was missing the instructional videos, so I also downloaded those from the Admin/Videos page.
On top of that, I’m using Wordpress and a lightweight WP Theme (“Education Mind”) that doesn’t make calls to the internet. I’m also using a caching Plugin. Installing mysql was no problem and seems to work well with php 7.
However, I also edited the “wp-config.php” file. This is supposed to block external requests (trying to get to the internet via calls can cause terrible performance issues, as your Pi will have no access to the internet). However, you may need this block commented out while configuring Wordpress during theme updates and plug-in downloads, etc. However, it’s best to find Themes and Plug-ins that “DO NOT” make external calls (you often see external calls for google fonts, for instance).
/** Block external requests */
Anyway, for now I have a nicely performing Pi Zero W build running.