diff --git a/setup.py b/setup.py
index c16a8285..5c9d613c 100755
--- a/setup.py
+++ b/setup.py
@@ -18,22 +18,34 @@
 
 url_repo_qt_fmt = "https://download.qt.io/online/qtsdkrepository/{os}_{arch}/desktop/qt{ver_maj}_{ver_concat}/"
 
-os_map = {"Linux": "linux",
-          "Windows": "windows",
-          "Darwin": "mac"}
-
-arch_map = {"i386": "x86",
-            "i686": "x86",
-            "x86": "x86",
-            "x86_64": "x64",
-            "AMD64": "x64"}
-
-os_compiler = {"Linux": "gcc",
-               "Windows": "msvc2019",
-               "Darwin": "clang"}
-
-arch_bits = {"x86": "32",
-             "x64": "64"}
+os_map = {
+    "Linux": "linux",
+    "Windows": "windows",
+    "Darwin": "mac",
+}
+
+arch_map = {
+    "i386": "x86",
+    "i686": "x86",
+    "x86": "x86",
+    "x86_64": "x64",
+    "AMD64": "x64",
+    "aarch64": "arm64",
+}
+
+os_arch_toolchain = {
+    "linux": {
+        "x64": "gcc_64",
+        "arm64": "linux_gcc_arm64",
+    },
+    "windows": {
+        "x64": "win64_msvc2019_64",
+        "arm64": "win64_msvc2019_arm64",
+    },
+    "mac": {
+        "x64": "clang_64",
+    },
+}
 
 def download_check_fail(url, expected_type):
     print("download URL:", url, flush=True)
@@ -146,21 +158,16 @@ def qt_download_check_extract(cfg, dir_install):
 
     metadata = ElementTree.fromstring(r.text)
 
-    compiler_bits = os_compiler[cfg['os']]+"_"+arch_bits[sys_arch]
-
-    if cfg['os'] == "Windows":
-        compiler = "win"+arch_bits[sys_arch]+"_"+compiler_bits
-    else:
-        compiler = compiler_bits
+    toolchain = os_arch_toolchain[sys_os][sys_arch]
 
     base_package_name = "qt.qt{ver_maj}.{ver_concat}.{compiler}".format(
         ver_maj = ver_maj, ver_concat = ver_concat,
-        compiler = compiler)
+        compiler = toolchain)
 
     extra_package_name = "qt.qt{ver_maj}.{ver_concat}.{module}.{compiler}".format(
         ver_maj = ver_maj, ver_concat = ver_concat,
         module = "{module}",
-        compiler = compiler)
+        compiler = toolchain)
 
     extra_package_names = list()
     for module in cfg['versions']['qt_modules']:
@@ -181,6 +188,9 @@ def qt_download_check_extract(cfg, dir_install):
                 if archive_name.startswith(module_name):
                     archives_match.append([package_name, data["version"], archive_name])
 
+    if not archives_match:
+        raise RuntimeError(f"no matches for Qt modules ({cfg['versions']['qt_modules']}) found")
+
     for package_name, package_version, archive_name in archives_match:
         url_archive = base_url+'/'+package_name+'/'+package_version+archive_name