How to fix FreePBX 15 The Module Named “arimanager” is required.

Problem:

When trying to install a FreePBX 15 module like Asterisk Info you see the error message

The Module Named "arimanager" is required.

but you can’t find the arimanager module in the list of available modules.

Solution:

As you can see in module.xml in arimanager’s GitHub repository (which you can find easily by just googling arimanager), the module is called

Asterisk REST Interface Users

In order to install it, you also need the manager module which is called

Asterisk API

Note that you can just click on the The Module Named "arimanager" is required. message if you disable your AdBlocker.