Installation error: Unable to connect to database Server

Hello. I'm Leandro Battista and I'm trying VTENEXT. I'm maving some issues installing it. I want to install it as local only. I installed XAMPP and I did all the configurations: I setted up the php.ini and installed ImageMagick and APCu so there's no warning messagess. Everything is fine until the System Configuration window.

This is the info I'm setting there:

Host Name: localhost
Server listen Port: Nothing or 3306
User name: root (I don't know if this is for access to VTENEXT with total privilegies or for the database)
Password: Nothing or something basic
Database Name: Default, something basic or something I previously created with MariaDB for trying. Of course I activated Create Database (Will drop if the database exists), UTF-8 Support is enabled and setted root as admin with a simple password.
URL: http://localhost/vtenext
Currency Name: Argentina, Pesos ($)

And after clicking Next, a Window pop up with the message:
Specify the exact host name instead of "localhost" in Site URL field, otherwise you will experience some issues while working with VTE plug-ins. Do you wish to Continue?

If I click Accept, the next window have this mesage:

Unable to connect to database Server. Invalid SQL Connection Parameters specified
This may be due to the following reasons:
- specified database user, password, hostname, database type, or port is invalid
- specified database user does not have access to connect to the database server from the host

Database Configuration
Database Type MySQL
Database Name vte20041_2208
Server listen Port
Database UTF-8 Support Not Enabled
Site Configuration
URL http://localhost/vtenext
Default Charset ISO-8859-1
Currency Name Argentina, Pesos($)

I don't know what I'm doing wrong. Can you help me with this? I will be very grateful!

Greetings from Argentina.

Thanks Denis. Now I can continue to the confirmation screen without any problems, but when I try to install I get the following message:

Fatal error: Cannot unset $this in D:\xampp\php\pear\adodb\adodb-xmlschema03.inc.php on line 178

When I open that file I can see this:

177 function destroy() {
178 unset( $this );
179 }

What's wrong?

Anyway, I'm trying to install this version of VTENEXT:

github.com/VTECRM/vtenext

The PHP version is 7.3.28 from XAMPP 7.3.28. This is the official installer: xampp-windows-x64-7.3.28-1-VC15-installer.exe

Thank you.