is Mega Cache ? disabled

You will have to enable caching in settings.

I mis WP_CONTENT/advanced-cache.php

advanced-cache.php is copied when cache is activated in the settings.

advanced-cache.php was not copied, I did a manual copy from the advanced-cache.php.txt file and renamed. Cache works now.

WP_CACHE must be set too.
Please download new version from https://wpmegacache.com
It is beta and not yet published on WP.

Please remove old version and install new to make sure all install steps are run.

All green! And Redis is now active.

Memcached is on. However, “Memcached status is NOT available” is that normal?

Is there a way to minify and optimize css and javascript loading?

Great.

Memcached is on. However, “Memcached status is NOT available” is that normal?
This means the php extension is enabled but memcached is not running.

>minify and optimize css and javascript

No, this is not related to page caching.
But inline script is gzip compressed with the html.

Can I combine Mega Cache with atec Cache Info and atec Cache APCu in regard to enabling the different caching systems? example: both Redis or not?

And the Mega Cacho pro license is not the same as the Atec license?

you can use atec Cache Info any time.
from atec Cache APCu you can use object cache.

for page caching choose either one, cache-apcu page cache OR mega cache.

these are two different licenses but there is a reduced multi license available.

“A reduced multi license available”

yes please

You can order at wpmegacache.com or atecplugins.com.
As I am not allowed to write anything commercial here, please contact me through these sites.

What is the difference between the free and paid versions?