Mac Acrobat Pro DC invalid serial number

i bought , downloaded acrobat pro dc update acrobat pro 8 , error message -- not valid serial number. please re-enter serial number. -- when try install. typing in correct serial number no dashes.

hi,

please refer links below  , when entering serial key , should be  dashes after every 4 numbers.

 

• invalid serial number error
• error "the serial number not valid product" | creative suite

 

hope you.

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