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: 6.x/5.x/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]
    
    
    

It's also possible to configure the 'Server protection' of Admin Tools in order to whitelist and allow assets from the desired components like 'com_gdpr', 'com_jrealtimeanalytics', etc. This could also be needed for each user using the extension:

Finally ensure that you also have not installed any AdBlocker in your browser that may interfere with CSS loading, in this case take care to disable it:

To be sure that all changes are applied, take care to:

• Completely wipe out browser cache.
• Delete Joomla Cache
• Full purge server cache or CloudFlare if used