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If you purchase Market Samurai with the same email address as your trial then Market Samurai should convert to a full version automatically.
If you purchased with a different email address you will need to enter your paid registration details manually.
Please click the button that says 'Paid? Enter your registration details' to enter your paid registration details
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It is not necessary to reinstall Market Samurai as the program will automatically unlock the paid features once the registration details are entered.