Hi aurora_Mo. You have to install 3 versions of AE (CC2015, CC, CS6).
Step 1: Open your project in CC2015 and select: File\Save As\ Save a copy as CC.
Step 2: Open new saved file in CC and select: File\Save As\ Save a copy as CS6.
Step 3: Open CS6 and check your project again because I saw a guy found a problem about Brightness and Contrast when he trying to save as an older version on Videohive forum.
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