diff --git a/aqt/installer.py b/aqt/installer.py
index c6cc0c7..3b4aaa1 100644
--- a/aqt/installer.py
+++ b/aqt/installer.py
@@ -257,13 +257,14 @@ class Cli:
             return False
         return True
 
-    def _check_modules_arg(self, qt_version, modules):
+    def _select_unexpected_modules(self, qt_version: str, modules: Optional[List[str]]) -> List[str]:
+        """Returns a sorted list of all the requested modules that do not exist in the combinations.json file."""
         if modules is None:
-            return True
+            return []
         available = Settings.available_modules(qt_version)
         if available is None:
-            return False
-        return all([m in available for m in modules])
+            return sorted(modules)
+        return sorted(set(modules) - set(available))
 
     @staticmethod
     def _determine_qt_version(
@@ -388,14 +389,23 @@ class Cli:
         auto_desktop_archives: List[QtPackage] = get_auto_desktop_archives()
 
         if not self._check_qt_arg_versions(qt_version):
-            self.logger.warning("Specified Qt version is unknown: {}.".format(qt_version))
+            self.logger.warning(
+                f'Specified Qt version "{qt_version}" did not exist when this version of aqtinstall was released. '
+                "This may not install properly, but we will try our best."
+            )
         if not self._check_qt_arg_combination(qt_version, os_name, target, arch):
             self.logger.warning(
-                "Specified target combination is not valid or unknown: {} {} {}".format(os_name, target, arch)
+                f'Specified target combination "{os_name} {target} {arch}" did not exist when this version of '
+                "aqtinstall was released. This may not install properly, but we will try our best."
             )
         all_extra = True if modules is not None and "all" in modules else False
-        if not all_extra and not self._check_modules_arg(qt_version, modules):
-            self.logger.warning("Some of specified modules are unknown.")
+        if not all_extra:
+            unexpected_modules = self._select_unexpected_modules(qt_version, modules)
+            if unexpected_modules:
+                self.logger.warning(
+                    f"Specified modules {unexpected_modules} did not exist when this version of aqtinstall was released. "
+                    "This may not install properly, but we will try our best."
+                )
 
         qt_archives: QtArchives = retry_on_bad_connection(
             lambda base_url: QtArchives(
@@ -465,7 +475,10 @@ class Cli:
         archives = args.archives
         all_extra = True if modules is not None and "all" in modules else False
         if not self._check_qt_arg_versions(qt_version):
-            self.logger.warning("Specified Qt version is unknown: {}.".format(qt_version))
+            self.logger.warning(
+                f'Specified Qt version "{qt_version}" did not exist when this version of aqtinstall was released. '
+                "This may not install properly, but we will try our best."
+            )
 
         srcdocexamples_archives: SrcDocExamplesArchives = retry_on_bad_connection(
             lambda base_url: SrcDocExamplesArchives(
@@ -562,7 +575,10 @@ class Cli:
 
         for arch in archs:
             if not self._check_tools_arg_combination(os_name, tool_name, arch):
-                self.logger.warning("Specified target combination is not valid: {} {} {}".format(os_name, tool_name, arch))
+                self.logger.warning(
+                    f'Specified target combination "{os_name} {tool_name} {arch}" did not exist when this version of '
+                    "aqtinstall was released. This may not install properly, but we will try our best."
+                )
 
             tool_archives: ToolArchives = retry_on_bad_connection(
                 lambda base_url: ToolArchives(
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 055c949..3ae35f1 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -53,13 +53,20 @@ def test_cli_help(capsys):
     assert expected_help(out)
 
 
-def test_cli_check_module():
+@pytest.mark.parametrize(
+    "qt_version, modules, unexpected_modules",
+    (
+        ("5.11.3", ["qtcharts", "qtwebengine"], []),
+        ("5.11.3", ["not_exist"], ["not_exist"]),
+        ("5.11.3", ["qtcharts", "qtwebengine", "not_exist"], ["not_exist"]),
+        ("5.11.3", None, []),
+        ("5.15.0", ["Unknown"], ["Unknown"]),
+    ),
+)
+def test_cli_select_unexpected_modules(qt_version: str, modules: Optional[List[str]], unexpected_modules: List[str]):
     cli = Cli()
     cli._setup_settings()
-    assert cli._check_modules_arg("5.11.3", ["qtcharts", "qtwebengine"])
-    assert not cli._check_modules_arg("5.7", ["not_exist"])
-    assert cli._check_modules_arg("5.14.0", None)
-    assert not cli._check_modules_arg("5.15.0", ["Unknown"])
+    assert cli._select_unexpected_modules(qt_version, modules) == unexpected_modules
 
 
 def test_cli_check_combination():
diff --git a/tests/test_install.py b/tests/test_install.py
index 9cae23d..81a650a 100644
--- a/tests/test_install.py
+++ b/tests/test_install.py
@@ -1052,7 +1052,8 @@ def test_install(
         (
             "install-qt windows desktop 5.16.0 win32_mingw73",
             None,
-            "WARNING : Specified Qt version is unknown: 5.16.0.\n"
+            'WARNING : Specified Qt version "5.16.0" did not exist when this version of aqtinstall was released. '
+            "This may not install properly, but we will try our best.\n"
             "ERROR   : Failed to locate XML data for Qt version '5.16.0'.\n"
             "==============================Suggested follow-up:==============================\n"
             "* Please use 'aqt list-qt windows desktop' to show versions available.\n",
@@ -1060,7 +1061,8 @@ def test_install(
         (
             "install-qt windows desktop 5.15.0 bad_arch",
             "windows-5150-update.xml",
-            "WARNING : Specified target combination is not valid or unknown: windows desktop bad_arch\n"
+            'WARNING : Specified target combination "windows desktop bad_arch" did not exist when this version of '
+            "aqtinstall was released. This may not install properly, but we will try our best.\n"
             "ERROR   : The packages ['qt_base'] were not found while parsing XML of package information!\n"
             "==============================Suggested follow-up:==============================\n"
             "* Please use 'aqt list-qt windows desktop --arch 5.15.0' to show architectures available.\n",
@@ -1068,7 +1070,8 @@ def test_install(
         (
             "install-qt windows desktop 5.15.0 win32_mingw73 -m nonexistent foo",
             "windows-5150-update.xml",
-            "WARNING : Some of specified modules are unknown.\n"
+            "WARNING : Specified modules ['foo', 'nonexistent'] did not exist when this version of aqtinstall "
+            "was released. This may not install properly, but we will try our best.\n"
             "ERROR   : The packages ['foo', 'nonexistent', 'qt_base'] were not found"
             " while parsing XML of package information!\n"
             "==============================Suggested follow-up:==============================\n"
@@ -1106,7 +1109,8 @@ def test_install(
         (
             "install-tool windows desktop tools_vcredist nonexistent",
             "windows-desktop-tools_vcredist-update.xml",
-            "WARNING : Specified target combination is not valid: windows tools_vcredist nonexistent\n"
+            'WARNING : Specified target combination "windows tools_vcredist nonexistent" did not exist when this version of '
+            "aqtinstall was released. This may not install properly, but we will try our best.\n"
             "ERROR   : The package 'nonexistent' was not found while parsing XML of package information!\n"
             "==============================Suggested follow-up:==============================\n"
             "* Please use 'aqt list-tool windows desktop tools_vcredist' to show tool variants available.\n",
@@ -1114,7 +1118,8 @@ def test_install(
         (
             "install-tool windows desktop tools_nonexistent nonexistent",
             None,
-            "WARNING : Specified target combination is not valid: windows tools_nonexistent nonexistent\n"
+            'WARNING : Specified target combination "windows tools_nonexistent nonexistent" did not exist when this '
+            "version of aqtinstall was released. This may not install properly, but we will try our best.\n"
             "ERROR   : Failed to locate XML data for the tool 'tools_nonexistent'.\n"
             "==============================Suggested follow-up:==============================\n"
             "* Please use 'aqt list-tool windows desktop' to show tools available.\n",