diff --git a/install.ps1 b/install.ps1
index 8321df15e..3c579f68a 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 = "f85ee09109492b6586240c75acd179916f570a663bf02ff8b303c019f88d1050"
+    $defaultInstallSha256 = "08be74d479990f072bd16033f258108a583b34baddfd75d9d9be11f23ae77dac"
     $maximumInstallerBytes = 2MB
     $installerExit = 0
     $installer = if ($PSScriptRoot) { Join-Path $PSScriptRoot "install.py" } else { $null }
diff --git a/install.py b/install.py
index 11db59f4a..a3a6e48aa 100644
--- a/install.py
+++ b/install.py
@@ -3098,8 +3098,21 @@ def normalize_platform(name: str, say: bool = True) -> str:
                 print(f"  {rule.name} gets the {display_name(rule.manifest)} file list: "
                       f"--platform {rule.manifest}.")
             return rule.manifest
+    # --list-platforms prints TrimUI with why it gets no folder, and naming
+    # it answered "Unknown platform".
+    for rule in _EMBEDDED_RULES:
+        if key and not rule.manifest and key == _name_key(rule.name):
+            refuse_name(name.strip(), f"{rule.name} is not installed to: "
+                        f"{_NO_FOLDER.get(rule.name, 'no source names its BIOS folder')}.",
+                        "  Name that folder: --platform retroarch "
+                        "--dest FOLDER")
+    # Every name --list-platforms prints, so that spruce suggests spruceOS
+    # and the count is the one the listing shows.
+    known = list(AVAILABLE_PLATFORMS) + list(dict.fromkeys(
+        rule.name for rule in _EMBEDDED_RULES
+        if _name_key(rule.name) not in {_name_key(plat) for plat in AVAILABLE_PLATFORMS}))
     refuse_name(name.strip(), f"Unknown platform '{name.strip()}'. "
-                + did_you_mean([name], list(AVAILABLE_PLATFORMS), "--list-platforms"))
+                + did_you_mean([name], known, "--list-platforms"))
 
 
 def _read_limited_json(
diff --git a/install.sh b/install.sh
index 251c35caa..1641ace5d 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="f85ee09109492b6586240c75acd179916f570a663bf02ff8b303c019f88d1050"
+DEFAULT_INSTALL_SHA256="08be74d479990f072bd16033f258108a583b34baddfd75d9d9be11f23ae77dac"
 MAX_INSTALLER_BYTES=2097152
 
 cleanup() {
diff --git a/install/launchers/index.json b/install/launchers/index.json
index 6e01ea755..39e53cb3d 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": 1082390,
-          "sha256": "f85ee09109492b6586240c75acd179916f570a663bf02ff8b303c019f88d1050",
+          "size": 1083185,
+          "sha256": "08be74d479990f072bd16033f258108a583b34baddfd75d9d9be11f23ae77dac",
           "executable": false
         },
         {
@@ -71,8 +71,8 @@
     "muos": {
       "archive": {
         "dest": "ARCHIVE/RetroBIOS.muxapp",
-        "size": 1136017,
-        "sha256": "9c0587fc18a1402e6f86eeaa8abf7bc26f52bf201e362575adc8e417c983b7de"
+        "size": 1136812,
+        "sha256": "070626dc9a11addef163495858e5e1ad6808e46522c9570fc4aa2909398b650d"
       },
       "members": [
         {
@@ -92,8 +92,8 @@
         {
           "name": "RetroBIOS/install.py",
           "repo_path": "install.py",
-          "size": 1082390,
-          "sha256": "f85ee09109492b6586240c75acd179916f570a663bf02ff8b303c019f88d1050",
+          "size": 1083185,
+          "sha256": "08be74d479990f072bd16033f258108a583b34baddfd75d9d9be11f23ae77dac",
           "executable": false
         },
         {
@@ -166,8 +166,8 @@
         {
           "dest": ".config/modules/retrobios/install.py",
           "repo_path": "install.py",
-          "size": 1082390,
-          "sha256": "f85ee09109492b6586240c75acd179916f570a663bf02ff8b303c019f88d1050",
+          "size": 1083185,
+          "sha256": "08be74d479990f072bd16033f258108a583b34baddfd75d9d9be11f23ae77dac",
           "executable": false
         },
         {
diff --git a/tests/test_install.py b/tests/test_install.py
index a711787cd..08283b0ee 100644
--- a/tests/test_install.py
+++ b/tests/test_install.py
@@ -4012,8 +4012,25 @@ class ATypoGetsTheClosestName(unittest.TestCase):
             self.assertIn(f"--platform {plat}", out.getvalue())
 
     def test_a_system_that_gets_no_list_is_still_refused(self):
-        with contextlib.redirect_stderr(io.StringIO()), self.assertRaises(SystemExit):
+        """TrimUI, which --list-platforms prints, was answered "Unknown
+        platform" with no way forward."""
+        err = io.StringIO()
+        with contextlib.redirect_stderr(err), self.assertRaises(SystemExit):
             install.normalize_platform("TrimUI")
+        self.assertNotIn("Unknown platform", err.getvalue())
+        self.assertIn("--platform retroarch --dest FOLDER", err.getvalue())
+
+    def test_a_system_name_is_suggested(self):
+        err = io.StringIO()
+        with contextlib.redirect_stderr(err), self.assertRaises(SystemExit):
+            install.normalize_platform("spruce")
+        self.assertIn("Did you mean: spruceOS?", err.getvalue())
+        # The distinct names --list-platforms prints: Batocera is both a
+        # platform and a system it recognises.
+        names = [*install.AVAILABLE_PLATFORMS,
+                 *(line.split(":")[0] for line in install._system_lines())]
+        listed = len({install._name_key(name) for name in names})
+        self.assertIn(f"lists all {listed}.", err.getvalue())
 
     def test_a_platform_typo_is_answered_with_one_name(self):
         err = io.StringIO()