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The only difference between the free and the PRO WordPress Ethereum Wallet plugin versions is the ability to work with ERC20/ERC223 tokens.
With the free version you can send Ether, display Ether balance and transactions history. And with the PRO version you can do it for ERC20/ERC223 tokens also.
See also: Upgrade Free to PRO version, Install and Configure WordPress Ethereum Wallet plugin.