ci: Download script_assets_test.json for Windows CI

diff --git a/.github/ci-windows-cross.py b/.github/ci-windows-cross.py
index 13ca3b49..d7d58d1d 100755
--- a/.github/ci-windows-cross.py
+++ b/.github/ci-windows-cross.py
@@ -10,6 +10,9 @@ import subprocess
 import sys
 from pathlib import Path
 
+sys.path.append(str(Path(__file__).resolve().parent.parent / "test"))
+from download_utils import download_script_assets
+
 
 def run(cmd, **kwargs):
     print("+ " + shlex.join(cmd), flush=True)
@@ -81,6 +84,9 @@ def prepare_tests():
     run(cmd_download_prev_rel)
     run([sys.executable, "-m", "pip", "install", "pyzmq"])
 
+    dest = workspace / "unit_test_data"
+    download_script_assets(dest)
+
 
 def run_functional_tests():
     workspace = Path.cwd()
@@ -117,6 +123,8 @@ def run_functional_tests():
 
 
 def run_unit_tests():
+    workspace = Path.cwd()
+    os.environ["DIR_UNIT_TEST_DATA"] = str(workspace / "unit_test_data")
     # Can't use ctest here like other jobs as we don't have a CMake build tree.
     commands = [
         ["./bin/test_bitcoin-qt.exe"],
diff --git a/.github/ci-windows.py b/.github/ci-windows.py
index caa2d52c..d38b087c 100755
--- a/.github/ci-windows.py
+++ b/.github/ci-windows.py
@@ -10,6 +10,9 @@ import subprocess
 import sys
 from pathlib import Path
 
+sys.path.append(str(Path(__file__).resolve().parent.parent / "test"))
+from download_utils import download_script_assets
+
 
 def run(cmd, **kwargs):
     print("+ " + shlex.join(cmd), flush=True)
@@ -103,10 +106,13 @@ def check_manifests(ci_type):
 
 
 def prepare_tests(ci_type):
+    workspace = Path.cwd()
     if ci_type == "standard":
         run([sys.executable, "-m", "pip", "install", "pyzmq"])
+        dest = workspace / "unit_test_data"
+        download_script_assets(dest)
     elif ci_type == "fuzz":
-        repo_dir = str(Path.cwd() / "qa-assets")
+        repo_dir = str(workspace / "qa-assets")
         clone_cmd = [
             "git",
             "clone",
@@ -120,11 +126,13 @@ def prepare_tests(ci_type):
 
 
 def run_tests(ci_type):
-    build_dir = Path.cwd() / "build"
+    workspace = Path.cwd()
+    build_dir = workspace / "build"
     num_procs = str(os.process_cpu_count())
     release_bin = build_dir / "bin" / "Release"
 
     if ci_type == "standard":
+        os.environ["DIR_UNIT_TEST_DATA"] = str(workspace / "unit_test_data")
         test_envs = {
             "BITCOIN_BIN": "bitcoin.exe",
             "BITCOIND": "bitcoind.exe",
@@ -157,7 +165,7 @@ def run_tests(ci_type):
             "--jobs",
             num_procs,
             "--quiet",
-            f"--tmpdirprefix={Path.cwd()}",
+            f"--tmpdirprefix={workspace}",
             "--combinedlogslen=99999999",
             *shlex.split(os.environ.get("TEST_RUNNER_EXTRA", "").strip()),
         ]
@@ -172,7 +180,7 @@ def run_tests(ci_type):
             num_procs,
             "--loglevel",
             "DEBUG",
-            str(Path.cwd() / "qa-assets" / "fuzz_corpora"),
+            str(workspace / "qa-assets" / "fuzz_corpora"),
         ]
         run(fuzz_cmd)
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ebd0986b..7178c2bd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -432,13 +432,12 @@ jobs:
       - name: Check executable manifests
         run: py -3 .github/ci-windows-cross.py check_manifests
 
+      - name: Prepare Windows test environment
+        run: py -3 .github/ci-windows-cross.py prepare_tests
+
       - name: Run unit tests
         run: py -3 .github/ci-windows-cross.py run_unit_tests
 
-      - name: Prepare Windows test environment
-        run: |
-          py -3 .github/ci-windows-cross.py prepare_tests
-
       - name: Run functional tests
         env:
           TEST_RUNNER_EXTRA: "--timeout-factor=${{ env.TEST_RUNNER_TIMEOUT_FACTOR }} ${{ case(github.event_name == 'pull_request', '', '--extended') }}"
diff --git a/test/download_utils.py b/test/download_utils.py
index a4f94d8d..c7fd6cf0 100644
--- a/test/download_utils.py
+++ b/test/download_utils.py
@@ -4,6 +4,7 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or https://opensource.org/license/mit/.
 
+import sys
 import time
 import urllib.request
 
@@ -46,3 +47,19 @@ def download_from_url(url, archive):
             raise RuntimeError(f"Download incomplete: expected {total_size} bytes, got {progress_bytes} bytes")
 
     print('\n', flush=True, end="") # Flush to avoid error output on the same line.
+
+
+def download_script_assets(script_assets_dir):
+    script_assets_dir.mkdir(parents=True, exist_ok=True)
+    script_assets = script_assets_dir / "script_assets_test.json"
+    url = "https://github.com/bitcoin-core/qa-assets/raw/main/unit_test_data/script_assets_test.json"
+    try:
+        download_from_url(url, script_assets)
+    except Exception as e:
+        print(f"\nDownload failed: {e}", file=sys.stderr)
+        print("Retrying download after failure ...", file=sys.stderr)
+        time.sleep(12)
+        try:
+            download_from_url(url, script_assets)
+        except Exception as e2:
+            sys.exit(e2)