how I install a language pack in Spanish?

Hello,

The extension contains English and Russian translations. You can read here how to create a new translation or edit existing one.

Regards,
ARI Soft

where i found file ini?

The following INI files are used by the extension (for English translation):

<joomla_directory>/language/en-GB/en-GB.com_ariquiz.ini
<joomla_directory>/language/en-GB/en-GB.com_ariquiz.ajax.ini

<joomla_directory>/administrator/language/en-GB/en-GB.com_ariquiz.ini
<joomla_directory>/administrator/language/en-GB/en-GB.com_ariquiz.sys.ini
<joomla_directory>/administrator/language/en-GB/en-GB.com_ariquiz.ajax.ini

You can use "Localise" extension to modify the files.

Regards,
ARI Soft