Omeka Plugins on DreamHost

I am attempting to install plugins for Omeka version 2.1.4 which is hosted through DreamHost. I accidentally deleted the folder containing Exhibit Builder and have been unsuccessful in uploading it as well as uploading the Neatline folder to the FTP. I keep getting the message "This is not a valid plugin." I have made sure to have the correct versions of both plugins but have been unsuccessful. Thanks for the assistance.

Can you unzip the download file in the Dreamhost FTP? As in these instructions?
Sometimes "this is not a valid plugin" reflects an error in the name of the plugin folder, so you might check those as well.