How to get rid of this notification?

I have just deleted all the pay to blog files and installed pro-site plugin

I have the following notification on top of admin area:

Please move the pay-to-blog-paypal.php file from the Pay To Blog plugin to your root directory!

I have deleted the file, triple checked it. The notification is still there. Activated Pro-site plugin with pay to blog module activated. Notification still there.

Is there a proper way to remove pay to blog entirely so i can migrate to pro-site?