Failed to load Easy WP SMTP

Hi there,

My name is Huy Le, the administrator of website https://www.mitgroup.vn

I am using the WordPress open source system to publish my website. But now I have problem in installing new plugin.

When I do a new plugin installation, the system says “This plugin has not been tested with your current WordPress version.”

Although I have updated to version 6.0.2, the system still requires WordPress version: 5.4 or higher

Many thanks in advance for any ideas on how to address the above.

Thank you
Mr.Huy

The page I need help with: [log in to see the link]