WordPress.org

1. Download Plugin and unzip.
2. Copy the Plugin Folder in your WordPress-Installation.
3. Activate the Plugin in your WP-Admin.
4. Create a folder for your galleries within your WordPress-Installation, wherever you want (has to be accessible from the internet).
5. Set the just create folder in WP-ImageFlow settings (WP-Admin -> Settings -> WP-ImageFlow)
6. Upload your image galleries to this folder in a subfolder

You can call a gallery by [wp-imageflow=FOLDERNAME].