fix: say what a platform's own check compares

install.ps1

@@ -16,7 +16,7 @@
     # and Invoke-WebRequest throws on a cut transfer before the hash is read:
     # the site's build rewrites this line there (scripts/sitebootstrap.py).
     $mismatchAdvice = "The download was most likely cut short: try again. Within minutes of an update of this project the two files can come from caches of different ages. Waiting five minutes settles that."
-    $defaultInstallSha256 = "5255181d018ce7020a619c6a31419da0dde862626bc57347cd0299a099e64f11"
+    $defaultInstallSha256 = "209c7614ad968cfc1cf30e69048acfb306cf5f8e3b14e3b00a6339699419e08c"
     $maximumInstallerBytes = 2MB
     $installerExit = 0
     $installer = if ($PSScriptRoot) { Join-Path $PSScriptRoot "install.py" } else { $null }