Just Work Email 0.5.4 — reassemble Windows installer (on-site parts)
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Download all five parts into the same folder:
  JW-Email-0.5.4-windows-x64.exe.part-00
  JW-Email-0.5.4-windows-x64.exe.part-01
  JW-Email-0.5.4-windows-x64.exe.part-02
  JW-Email-0.5.4-windows-x64.exe.part-03
  JW-Email-0.5.4-windows-x64.exe.part-04

Parts are 20 MiB each (last part smaller). Do not put the full ~92 MB exe on the CDN —
Cloudflare Pages ~25 MiB per-file limit.

PowerShell (.NET FileStream preferred):
  $out = "JW-Email-0.5.4-windows-x64.exe"
  $fs = [System.IO.File]::Create($out)
  0..4 | ForEach-Object {
    $p = "JW-Email-0.5.4-windows-x64.exe.part-{0:D2}" -f $_
    $bytes = [System.IO.File]::ReadAllBytes($p)
    $fs.Write($bytes, 0, $bytes.Length)
  }
  $fs.Close()
  Get-FileHash $out -Algorithm SHA256
  # expect: 88ad86ebd587b97bbcdd7c066c29866a530a9f841259c77bd764dcc061e51f6d

bash / Git Bash / WSL:
  cat JW-Email-0.5.4-windows-x64.exe.part-0{0,1,2,3,4} > JW-Email-0.5.4-windows-x64.exe
  sha256sum JW-Email-0.5.4-windows-x64.exe
  # expect: 88ad86ebd587b97bbcdd7c066c29866a530a9f841259c77bd764dcc061e51f6d

Joined size: 95282165 bytes
Ask Grok build (Windows unsigned staging).