diff --git a/server/fishtest/api.py b/server/fishtest/api.py
index 22755e5fa..6a403e512 100644
--- a/server/fishtest/api.py
+++ b/server/fishtest/api.py
@@ -34,7 +34,7 @@
 according to the route/URL mapping defined in `__init__.py`.
 """
 
-WORKER_VERSION = 241
+WORKER_VERSION = 242
 
 
 @exception_view_config(HTTPException)
diff --git a/worker/games.py b/worker/games.py
index 64463a3c5..72c3aacf8 100644
--- a/worker/games.py
+++ b/worker/games.py
@@ -328,7 +328,9 @@ def download_net(remote, testing_dir, net, global_cache):
         url = remote + "/api/nn/" + net
         print("Downloading {}".format(net))
         content = requests_get(url, allow_redirects=True, timeout=HTTP_TIMEOUT).content
-        cache_write(global_cache, net, content)
+        hash = hashlib.sha256(content).hexdigest()
+        if hash[:12] == net[3:15]:
+            cache_write(global_cache, net, content)
     else:
         print("Using {} from global cache".format(net))
 
@@ -728,11 +730,16 @@ def setup_engine(
             item_url = github_api(repo_url) + "/zipball/" + sha
             print("Downloading {}".format(item_url))
             blob = requests_get(item_url).content
-            cache_write(global_cache, sha + ".zip", blob)
+            blob_needs_write = True
         else:
+            blob_needs_write = False
             print("Using {} from global cache".format(sha + ".zip"))
 
         file_list = unzip(blob, tmp_dir)
+        # once unzipped without error we can write as needed
+        if blob_needs_write:
+            cache_write(global_cache, sha + ".zip", blob)
+
         prefix = os.path.commonprefix([n.filename for n in file_list])
         os.chdir(tmp_dir / prefix / "src")
 
diff --git a/worker/sri.txt b/worker/sri.txt
index ee2cad5b6..d83458829 100644
--- a/worker/sri.txt
+++ b/worker/sri.txt
@@ -1 +1 @@
-{"__version": 241, "updater.py": "Mg+pWOgGA0gSo2TuXuuLCWLzwGwH91rsW1W3ixg3jYauHQpRMtNdGnCfuD1GqOhV", "worker.py": "BMuQUpxZAKF0aP6ByTZY1r06MfPoIbdG2xraTrDQQRKgvhzJo6CKmeX2P8vX/QDm", "games.py": "9dFaa914vpqT7q4LLx2LlDdYwK6QFVX3h7+XRt18ATX0lt737rvFeBIiqakkttNC"}
+{"__version": 242, "updater.py": "Mg+pWOgGA0gSo2TuXuuLCWLzwGwH91rsW1W3ixg3jYauHQpRMtNdGnCfuD1GqOhV", "worker.py": "+66zNfqqaj7qSXNsX4QNznCFmcbNFl3U3r/afv8XcB6rz7d8q8GD9njQi8f8L/1J", "games.py": "nzbBgbzn479L3an/YlD4b08uk8mLt7htmwSDqaFVbS7s4UBUmgkPrNqvuLj9JRTd"}
diff --git a/worker/worker.py b/worker/worker.py
index bfc40c95d..9b861b13e 100644
--- a/worker/worker.py
+++ b/worker/worker.py
@@ -68,7 +68,7 @@
 MIN_CLANG_MAJOR = 8
 MIN_CLANG_MINOR = 0
 
-WORKER_VERSION = 241
+WORKER_VERSION = 242
 FILE_LIST = ["updater.py", "worker.py", "games.py"]
 HTTP_TIMEOUT = 30.0
 INITIAL_RETRY_TIME = 15.0