Installation:

After installed, the DLC will be downloaded in your local folder.
Check your game library, right click "The Other: Airi's Adventure", click "properties" and find the "local files".
It's in the folder "Airi's Adventure OST".

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The Original Soundtrack of The Other: Airi's Adventure.
It contains 15 tracks of the original music (mp3) in the game, include 2 bonus tracks and a small booklet (pdf).
*Please note that the royalty free tracks are not included in the OST.

Composers: Larz, Qingqi, Zephysonas, Lee
Artist: RabbitonBooks, Shencao

Full track list:

01 Afternoon Tea
02 Winds and Fields
03 Twilight Adventure
04 The Mysterious and the Curious (also in TWTP OST)
05 Sunshine
06 Shinigami Shojo (8-bit version)
07 Deserted Mountain
08 The Moment
09 Ruin
10 The Crownless King
11 Ryan's Choice
12 The World with You
13 Saturday

Bonus Tracks:
14 The Silent Sea
15 Shinigami Shojo (Original version)