question: How to set a password (and an email address) for your ExpressVPN account
answer: 
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  When you sign up for the free trial on the ExpressVPN app for iOS or Android, you are not required to set a password (and an email address). Without them, you can still create an account for ExpressVPN Keys and use it on the device which you signed up for the free trial. However, you cannot set up or use ExpressVPN Keys on all your other desktop or mobile devices.
  
  To set up ExpressVPN Keys on your other devices, you will need to set a password (and an email address) for your ExpressVPN account.
  
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