diff --git a/install.ps1 b/install.ps1
index b8c036982..50bed9a95 100644
--- a/install.ps1
+++ b/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 = "5f933d4ab032e6e401341818a35eeee9b4018932fde7ad5111fa789375fb350a"
+    $defaultInstallSha256 = "5b8bd7b486d236ee1d00439b2bdd4f6fefcf20112abe3b0f1037e38426d80c15"
     $maximumInstallerBytes = 2MB
     $installerExit = 0
     $installer = if ($PSScriptRoot) { Join-Path $PSScriptRoot "install.py" } else { $null }
diff --git a/install.py b/install.py
index 6ff0322db..13022a7ad 100644
--- a/install.py
+++ b/install.py
@@ -6122,11 +6122,11 @@ def _report_outcome(
     # A failure the progress already named on its FAILED line is not named
     # again: line mode listed each one twice (tui_audit_17 P3-7).
     unsaid = [failure for failure in failures or [] if failure[0] not in SAID_FAILED]
-    if unsaid and len(unsaid) > 1 and len(reasons) == 1 and reasons != {""}:
+    if failures and len(failures) > 1 and len(reasons) == 1 and reasons != {""}:
         # One cause, said once: a read-only folder listed ten of its files
         # and "... and 266 more" above the advice that fixes them all.
-        say(f"  failed: {_plural(len(unsaid), 'file')} ({reasons.pop()}), "
-            f"first {unsaid[0][0]}")
+        said = f", first {unsaid[0][0]}" if unsaid else ""
+        say(f"  failed: {_plural(len(failures), 'file')} ({reasons.pop()}){said}")
     else:
         for dest, reason in unsaid[:10]:
             say(f"  failed: {dest}" + (f" ({reason})" if reason else ""))
@@ -15547,7 +15547,7 @@ def core_count_words(cores: list[str], base: list[str]) -> str:
 
 def _tui_systems_chosen(state: TuiState) -> list[str]:
     """The systems the run is narrowed to, [] for every system."""
-    return [value for flag, value in _tui_system_flags(state) if value]
+    return [value for _flag, value in _tui_system_flags(state) if value]
 
 
 def _chosen_cores(state: TuiState) -> set[str] | None:
diff --git a/install.sh b/install.sh
index d8296c900..c2f6353e9 100755
--- a/install.sh
+++ b/install.sh
@@ -23,7 +23,7 @@ DEFAULT_INSTALL_URL="https://raw.githubusercontent.com/Abdess/retrobios/main/ins
 # curl or wget stop on a cut transfer before the hash is read: the site's
 # build rewrites this line there (scripts/sitebootstrap.py).
 MISMATCH_ADVICE="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."
-DEFAULT_INSTALL_SHA256="5f933d4ab032e6e401341818a35eeee9b4018932fde7ad5111fa789375fb350a"
+DEFAULT_INSTALL_SHA256="5b8bd7b486d236ee1d00439b2bdd4f6fefcf20112abe3b0f1037e38426d80c15"
 MAX_INSTALLER_BYTES=2097152
 
 cleanup() {
diff --git a/install/launchers/index.json b/install/launchers/index.json
index 31d0df546..14b41d3db 100644
--- a/install/launchers/index.json
+++ b/install/launchers/index.json
@@ -27,8 +27,8 @@
         {
           "dest": "roms/ports/retrobios/install.py",
           "repo_path": "install.py",
-          "size": 996363,
-          "sha256": "5f933d4ab032e6e401341818a35eeee9b4018932fde7ad5111fa789375fb350a",
+          "size": 996397,
+          "sha256": "5b8bd7b486d236ee1d00439b2bdd4f6fefcf20112abe3b0f1037e38426d80c15",
           "executable": false
         },
         {
@@ -71,8 +71,8 @@
     "muos": {
       "archive": {
         "dest": "ARCHIVE/RetroBIOS.muxapp",
-        "size": 1049540,
-        "sha256": "a7a9c2f9b7d018d0aca34731957a13d9d8ab22ea747381e6750d45abbfb70390"
+        "size": 1049574,
+        "sha256": "30bbe8a0f78cc7b6bb37b9290c69e2244e0b9217339d9ea695f45c0d7815a263"
       },
       "members": [
         {
@@ -92,8 +92,8 @@
         {
           "name": "RetroBIOS/install.py",
           "repo_path": "install.py",
-          "size": 996363,
-          "sha256": "5f933d4ab032e6e401341818a35eeee9b4018932fde7ad5111fa789375fb350a",
+          "size": 996397,
+          "sha256": "5b8bd7b486d236ee1d00439b2bdd4f6fefcf20112abe3b0f1037e38426d80c15",
           "executable": false
         },
         {
@@ -166,8 +166,8 @@
         {
           "dest": ".config/modules/retrobios/install.py",
           "repo_path": "install.py",
-          "size": 996363,
-          "sha256": "5f933d4ab032e6e401341818a35eeee9b4018932fde7ad5111fa789375fb350a",
+          "size": 996397,
+          "sha256": "5b8bd7b486d236ee1d00439b2bdd4f6fefcf20112abe3b0f1037e38426d80c15",
           "executable": false
         },
         {
diff --git a/schemas/install-events.schema.json b/schemas/install-events.schema.json
index 62db8c06b..f43b4ebf8 100644
--- a/schemas/install-events.schema.json
+++ b/schemas/install-events.schema.json
@@ -17,6 +17,7 @@
         "scanned",
         "version",
         "choices",
+        "set_aside",
         "file",
         "system",
         "checking",
@@ -58,6 +59,9 @@
     {
       "$ref": "#/$defs/choices"
     },
+    {
+      "$ref": "#/$defs/set_aside"
+    },
     {
       "$ref": "#/$defs/file"
     },
@@ -299,6 +303,29 @@
         }
       }
     },
+    "set_aside": {
+      "type": "object",
+      "additionalProperties": false,
+      "required": [
+        "event",
+        "platform",
+        "dests"
+      ],
+      "properties": {
+        "event": {
+          "const": "set_aside"
+        },
+        "platform": {
+          "type": "string"
+        },
+        "dests": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        }
+      }
+    },
     "file": {
       "type": "object",
       "additionalProperties": false,
diff --git a/tests/netguard/sitecustomize.py b/tests/netguard/sitecustomize.py
index 2aa5f732d..d7ab23fb8 100644
--- a/tests/netguard/sitecustomize.py
+++ b/tests/netguard/sitecustomize.py
@@ -27,7 +27,9 @@ _SAVED: dict = {}
 
 def _refuse(host: object) -> None:
     where = os.environ.get(NETLOG)
-    if where:
+    # A name under .invalid never resolves (RFC 2606): a test names one to
+    # fail on purpose, refused here before its DNS query leaves.
+    if where and not str(host).endswith(".invalid"):
         with open(where, "a", encoding="utf-8") as log:
             log.write(f"{os.getpid()} {host} {' '.join(sys.argv)[:300]}\n")
     raise OSError(errno.ENETUNREACH, f"a test makes no request to {host}")
diff --git a/tests/test_install.py b/tests/test_install.py
index 6ddeebd43..23bcb7efd 100644
--- a/tests/test_install.py
+++ b/tests/test_install.py
@@ -10,6 +10,7 @@ import io
 import json
 import os
 import stat
+import select
 import shlex
 import re
 import shutil
@@ -4182,17 +4183,35 @@ class AQuestionLeftWithCtrlDOrCtrlCIsAStop(unittest.TestCase):
 
         home = Path(_tempdir(self))
         master, slave = pty.openpty()
+        # Its output on the terminal too: piped, nothing is asked, and the
+        # test skipped on every machine.
         proc = subprocess.Popen(
-            [sys.executable, "install.py"], cwd=REPO_ROOT, stdin=slave,
-            stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True,
-            env={**os.environ, "HOME": str(home), "RETROBIOS_OS": "linux"},
+            [sys.executable, "install.py", "--plain"], cwd=REPO_ROOT, stdin=slave,
+            stdout=slave, stderr=slave,
+            # No request leaves the machine: the standalone emulators' lists
+            # come from the network (code_audit_24 P3-13).
+            env={**os.environ, "HOME": str(home), "RETROBIOS_OS": "linux",
+                 "RETROBIOS_INSTALL_OFFLINE": "1"},
         )
         os.close(slave)
         self.addCleanup(os.close, master)
-        time.sleep(3)
+        out = ""
+        deadline = time.monotonic() + 60
+        while "Which setup?" not in out and proc.poll() is None \
+                and time.monotonic() < deadline:
+            if select.select([master], [], [], 0.2)[0]:
+                out += os.read(master, 65536).decode("utf-8", "replace")
         os.write(master, b"\x04")
-        out, _ = proc.communicate(timeout=60)
-        if "Choose the platform" not in out:
+        proc.wait(timeout=60)
+        while select.select([master], [], [], 0.2)[0]:
+            try:
+                chunk = os.read(master, 65536)
+            except OSError:
+                break
+            if not chunk:
+                break
+            out += chunk.decode("utf-8", "replace")
+        if "Which setup?" not in out:
             self.skipTest("a platform was detected on this machine")
         self.assertEqual(proc.returncode, 130, out)
         self.assertIn("Stopped", out)
@@ -5211,6 +5230,8 @@ class EventsDescribeTheRun(unittest.TestCase, _SyntheticTree):
             # The systems Choose systems lists, before the files are read.
             {"event": "choices", "platform": "retroarch",
              "systems": ["sys-a", "sys-b", "other"]},
+            # Nothing set aside before the choice (code_audit_24 P3-3).
+            {"event": "set_aside", "platform": "retroarch", "dests": []},
             # a.bin and b.bin are in place: the first read and the last.
             {"event": "checking", "files_done": 1, "files_total": 2},
             {"event": "checking", "files_done": 2, "files_total": 2},
diff --git a/tests/test_install_tui.py b/tests/test_install_tui.py
index 802d09079..511bebc7f 100644
--- a/tests/test_install_tui.py
+++ b/tests/test_install_tui.py
@@ -823,9 +823,16 @@ class Widgets(unittest.TestCase):
         state = fresh_state()
         press(state, "up")
         self.assertEqual(state.focus["setup"], 2)
-        state = self.systems_state(20)
+        state = fresh_state()
+        state.stack = ["setup", "platforms"]
         press(state, "up")
-        self.assertEqual(state.focus["systems"], 0)
+        self.assertEqual(state.focus["platforms"], 0)
+        # A list of ticks wraps at any length: None and Done, at its end,
+        # are a few presses up from its first item (tui_audit_17 P3-1).
+        state = self.systems_state(20)
+        state.focus["systems"] = 0
+        press(state, "up")
+        self.assertEqual(install.tui_rows(state)[state.focus["systems"]].action, "done")
 
     def test_filter_ignores_case_and_accents(self):
         state = self.systems_state(3)
@@ -6777,7 +6784,12 @@ class AuditSevenScreens(unittest.TestCase):
         with SaveDirectoryRepository() as repo:
             argv = ["install.py", "--platform", "retroarch", "--dest", str(repo.dest),
                     "--manifest", str(repo.root / "install" / "retroarch.json")]
+            # The files come from the repository on the loopback: the module
+            # read its base before the environment named it (code_audit_24
+            # P3-13).
+            served = repo.env()["RETROBIOS_BASE_URL"] + "/{path}"
             with mock.patch.dict(os.environ, repo.env()), \
+                    mock.patch.object(install, "RAW_FILE_URL", served), \
                     mock.patch.object(sys, "argv", argv), \
                     mock.patch.object(sys.stdin, "isatty", return_value=True), \
                     mock.patch.object(install, "_is_terminal", return_value=True), \