Getting Don't Have Permission To Access /admin.php With The Cs-Cart Trial Version

Hello,

I'm trying to evaluate cs-cart trial version but I'm getting:

403 Forbidden You don't have permission to access /admin.php on this server

when I'm trying to create a new category or just to replace the demo store main logo.

Got the similar result if I click on the Admin panel's Edit texts, style or structure buttons.

403 Forbidden You don't have permission to access /index.php on this server

I did a google search before posting and found some topics about a similar problems but nothing related to the trial version.

Everything else seems find. I looked at the database admin and group records and file permissions on the web server. I followed the installation instructions, cannot find any problems there.

Is it a limitation of the trial version, not only time limited?

I'm using Centos Web panel on Cento 8 to manage cs-cart

Thank you for you help.