I have found the cause of the problem.
On the website I use Akeeba AdminTools.
Apparently AdminTools is blocking the CB installation process.
After installation the message appears: Installation component successful.
But not the CB information that should appear during installation.
After I temporarily disabled Backend Protection in Akeeba AdminTools, the installation of CB went well.
After the installation I re-enabled Backend Protection and CB continues to work fine.
I think it would be useful for others to know this.
It is the way how CB is installing the component.
It seems to be not the legal way for installing a Joomla extension.
So that is why AdminTools is blocking the process.
This is what Akeeba says about it:
You cabn find the answer of Akeeba in AdminTools ticket #36156 at akeeba.com
Akeeba website:.. /support/admin-tools/Ticket/36156:admintools-is-blocking-the-installation-of-community-builder.html
Package Installer from CB Package Builder uses Joomla installer API to install extensions. There is nothing wrong with doing it this way. Admin Tools is not Joomla core. Whatever protections it applies has nothing to do with what is and is not allowed. We're using perfectly valid and safe API. Package Installer completely removes itself once completed as well. Package Installer allows us to generate custom installers including any number of our components, modules, plugins, and cb plugins.
It's also done this way because Joomla extension installation is terrible for large packages. A standard Joomla package would install everything at once without a chance to clear memory. Package Installer installs extensions 1 by 1 using ajax calls to clear memory. This means a large package with even 100 extensions cannot crash your site.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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