If the backend interface does not display correctly and it's not possible to visualize images, icons, css, etc there are 2 possible common reasons:

• The package installed does not match your current Joomla version. Double check which package is installed given that each one is marked for a specific Joomla version: 4.x, 3.x, etc
• Akeeba Admin Tools has generated a htaccess file that is blocking all assets and resources for third-party extensions. In this case restore the original Joomla htaccess or remove the following lines in the htaccess file generated by Akeeba Admin Tools:
  
  
  • RewriteRule ^administrator/ - [F]
    
    
  • # Disallow access to all other PHP files throughout the site, unless they are explicitly allowed RewriteCond %{REQUEST_FILENAME} (\.php)$
    RewriteCond %{REQUEST_FILENAME} -f
    RewriteRule (.*\.php)$ - [F]
    
    
    
  • # Disallow access to all other front-end files
    RewriteCond %{REQUEST_FILENAME} -f
    RewriteRule !^index.php$ - [F]