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Old FSUIPC 3 key works with FSUIPC 4 in FSX?

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Hi Peter!

may i use my old registration key used in FS9 with FSUIPC 3.75 as registration key for FSUIPC 4 in FSX with Windows Vista?

My first attempt was negative , as i received the message "this is a not valid key for FSUIPC4", so i suppose i should now pay again for another registration key, is it correct?

Best regards


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