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Thank you for showing interest in our plugin Daniel.
There is no user limit on the free edition of the plugin. It is a fully functional 2FA plugin. The main differences between the Premium and the Free are more features, such as more 2FA methods, trusted devices and other features that make 2FA easier to use etc.
However, with the Free edition of the plugin you can have a fully functional 2FA solution.
I hope the above answers your question. Should you need more information, do not hesitate to ask.
Have a great day.