GamiPress is open-source and you can download it directly from the WordPress repository. There is no premium version of GamiPress Free so you get everything

GamiPress Plugin WordPress Features

• Points types
  Configure as many points types as you like: Credits, Gems, Coins, etc.
• Achievement types
  Configure as many achievement types as you like: Badges, Quests, etc.
• Rank types
  Configure as many rank types as you like: Grade, Level, etc.
• Automatic points awards and deductions
  Easily configure automatic ways to award or deduct points to your users.
• Custom requirements:
  Define conditional requirements the user needs to meet for unlock any achievement or rank.
• Time limit requirements
  Limit by time period when the user can complete a specific requirement
• Drag and drop controls
  Powerful controls to setup your gamification environment in minutes.
• Social sharing
  Users can share the achievements and ranks they have earned on any social network of their choice.
• Emails
  Your users will get notified automatically about new awards.
• Logs
  Flexible log system with support for public and private logs.
• Unlock achievements and ranks using points
  Let users to optionally unlock any achievement or rank by expending an amount of points without meet the requirements.
• Open Badges compatible
  Connect your site achievements with Badgr or Credly to issue open badges as an official recognition of the skills of your users.
• Blocks, Shortcodes & Widgets
  WordPress-friendly block, shortcodes and widgets to show the user points wallet, earned achievements, latest logs, and more.
• Live shortcode embedder
  Missing a shortcode parameter? Just press the “Insert GamiPress Shortcode” button and set up any shortcode without a worry.
• GDPR Support
  Support for WordPress personal data exports and deletions.
• Templates System
  Overwritable templates system to allow you customize everything you want through your GamiPress theme folder.
• Data centralization on Multisite
  Centralize all the data on multisite installs and show anything you want on any sub-site.
• Developer-friendly
  GamiPress is extremely flexible with plenty of hooks to add custom features and functionalities.