If you are getting 403 – forbidden error when you click on banner – It’s ModSecurity causing that error. The mod security rules for each server/vps are configured differently In this case please contact your hosting provider and request them to add an exception rule to fix this issue.
In latest WordPress versions starting from 3.6.1, .swf extention is no longer allowed by default. WordPress has disabled swf file uploads for security reasons. Please refer to http://codex.wordpress.org/Version_3.6.1 for more details. But still if you want to uload the swf file as a banner on your site – please do below mentioned changes. Open functions.php.
We have just released an update to WP AdCenter version 1.6.1 – you can use the same download link you have with you. If still you are not able to download the plugin, please contact us so that we can quickly send it to you. How To Upgrade To upgrade, delete the previous WP Ad.