I can NOT export my Custom Sidebars

We created about 50 custom sidebars with the free version of the “Custom Sidebars” Plugin a while back. Now we need to change the theme so we purchased the “Pro” version of the plugin so we can export the sidebars and import them after the theme change. We downloaded the WPMU dashboard and upgraded the free Custom Sidebars plugin to Pro. I still CANNOT export the sidebars. It looks like it will do it but no file is created. Why is that?

Please contact me to solve this issue.

Thanks,

Luis