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Unable to validate your license. Please contact technical su

Grandpa
in PMDG 747-8

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I had to reinstall my legacy boxed Version of the pmdg B 747 for my FSX. Now I ´d like to reinstall my downloaded Expansion pack of the Version 747-400 8. After starting the Installation I always get an erropr message saying: Unable to validate your license. Please contact PMDG Technical Support. Im not able to contact. I´ve forgotten the Password. A new Password doesn´t work. 

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