Go PRO to get these benefits:

• 1 year license for 1 site
  
• 1 year of updates
  
• 1 year of premium email support
  
• Access to all current & future PRO features
  
• More than 50 extra features & options

Don't like paying yearly or have more than 1 site? Then get the one-time payment unlimited lifetime agency license. It really is cheaper ;)

After buying, just copy & paste the license key displayed on the screen (a copy will be emailed to you, don't worry) in the plugin. If you already have GMW installed you don't have to download any new files.