convert indesign C6 to C5

I have 1 indesign files wich are created with a test version indesign version c6.

This version expired and my developer can't open them because she has an older version (c5)

Who van open and save this file in c5

This project concerns 2 files!

I had a testversion of indesign, c6 or number 19,
My designer has version 9.2.2

虚拟助手

项目ID： #6252718

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