Windows 8.1 Pro DSP Update Limited Pack
The Windows 8.1 Pro DSP Update Limited Pack (Japanese: DSP版 Windows 8.1 Pro Update限定パック) is a special Windows 8.1 bundle by Windows Navi+ that includes the Future Update CD-DA, containing the titular song sung by Nanami (VA: Nana Mizuki) and Claudia Madobe (Eri Kitamura). 2014 of these Packs were made[1][2][3][4].
One could also get a bonus disc during the Windows Spring Festival 2014 at the Bellesalle Akihabara from 11:00 on May 4 if a proof of purchase or reservation of the Pack was provided. It contains a 1600 × 900 wallpaper and an audio recording of Nanami, Claudia, Yū (Asuka Nishi) and Ai (Nao Tamura). It is unknown how many Bonus Discs were made.
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Future Update Disc
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Bonus Disc