WordPress.org

Extract the zip file and just drop the contents in the wp-content/plugins/ directory of your WordPress installation and then activate the plugin from plugins page. You get 'WP Flash Uploader' and 'Sync Media Library' in the 'Media' menu and 'WP Flash Uploader' in the 'Settings' menu.

Go to Settings->WP Flash Uploader and check the 'Limitations' part. Most of the users can upload and are only restricted by their servers. And most if the problems can be solved!