Topic: The plugin does not have a valid header.
Have WP-SimpleViewer installed and I like it
Bought the Pro version and downloaded it to desktop.
Unpacking and installing backend: Plugin Installed successfully.
When activating the plugin in WP(2.9.2) I get the message: The plugin does not have a valid header.
Downloaded Pro 3 times.
Deactivated SimpleViewer before installing Pro
Tried not to activate Pro after uploading/unpacking and returned to plugin page, but it didn't show up there.
What to do?