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The manual is available on the Steam store page:

https://cdn.akamai.steamstatic.com/steam/apps/91700/manuals/EYE_manual.pdf

The soundtrack is available via Streumon's website:

http://eye.streumon-studio.com/index.php?page=music
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The composer (Olivier "__MaX__" ZUCCARO) has both the OST (22 tracks) and UST (6 tracks) on his website for listening and downloading, along with information on the latter individually.

https://www.olivierzuccaro.com/projects/e-y-e-divine-cybermancy/