The Peter Gabriel - So (2012 Remastered) album is available in high-resolution FLAC format, often featuring a 24-bit / 44.1 kHz or 24-bit / 96 kHz studio master quality.
If you are looking for this specific release, it is commonly found on high-resolution music storefronts:
ProStudioMasters: Offers the 2012 Remastered version in 24-bit PCM. Note that while it is mastered in 96 kHz, tracks 1-3 and 5-9 are sourced from 44.1 kHz/24-bit studio masters.
Juno Download: Lists the 25th Anniversary Deluxe Edition (released 2012, digital updated later) with lossless FLAC options. peter gabriel so 2012 flac 2448 new
Bandcamp: Peter Gabriel's official Bandcamp page provides various lossless formats, including FLAC, for his discography. Product Details Album: So (2012 Remaster/25th Anniversary Edition) Format: FLAC (Lossless)
Resolution: 24-bit (Sample rates vary by track between 44.1 kHz and 96 kHz)
Key Tracks: Includes the high-resolution digital transfer of "In Your Eyes" and the #1 hit "Sledgehammer". The Peter Gabriel - So (2012 Remastered) album
Peter Gabriel, So (2012 Remastered) in High-Resolution Audio
However, a critical clarification is needed for accuracy: There is no official Peter Gabriel studio album or live album from 2012 that was originally released in 24-bit/48kHz. The specific string “2448” typically refers to a sample rate of 48 kHz and a bit depth of 24 bits.
What most likely exists—and what is traded among high-resolution audio collectors—is an upsampled or digitally remastered fan transfer of material from that era, or a mislabeled file. An Analysis of Peter Gabriel’s 2012 Audio Output
Here is an informative paper on the subject, detailing the actual releases of 2012 and the technical context of the "2448" files you have encountered.
Some audiophiles turn their noses up at 48 kHz, demanding 96 or 192. For So, that is a mistake. The original digital multitracks ran at 48 kHz. A 96 kHz version of this album is mathematically interpolated; it adds samples that were never there. The native 48 kHz transfer is the most honest representation of what the engineers heard in 1986.
Furthermore, the 24-bit depth provides a theoretical dynamic range of 144dB. Compare that to 16-bit’s 96dB. On So, where Gabriel uses extreme quiet (whispers on "We Do What We're Told") and extreme volume (the full-band chorus of "Big Time"), those extra 48dB ensure that the noise floor is non-existent. You aren't listening to a recording; you are in the room.