diff --git a/idc_index/index.py b/idc_index/index.py
index 229524a7..d51d4dc0 100644
--- a/idc_index/index.py
+++ b/idc_index/index.py
@@ -574,8 +574,8 @@ def _validate_update_manifest_and_get_download_size(
         # create a copy of the index
         index_df_copy = self.index
 
-        # Extract s3 url and crdc_instance_uuid from the manifest copy commands
-        # Next, extract crdc_instance_uuid from aws_series_url in the index and
+        # Extract s3 url and crdc_series_uuid from the manifest copy commands
+        # Next, extract crdc_series_uuid from aws_series_url in the index and
         # try to verify if every series in the manifest is present in the index
 
         # TODO: need to remove the assumption that manifest commands will have 'cp'
@@ -603,8 +603,9 @@ def _validate_update_manifest_and_get_download_size(
                 seriesInstanceuid,
                 s3_url,
                 series_size_MB,
-                index_crdc_series_uuid==manifest_crdc_series_uuid AS crdc_series_uuid_match,
+                index_crdc_series_uuid is not NULL as crdc_series_uuid_match,
                 s3_url==series_aws_url AS s3_url_match,
+                manifest_temp.manifest_cp_cmd,
             CASE
                 WHEN s3_url==series_aws_url THEN 'aws'
             ELSE
@@ -623,19 +624,23 @@ def _validate_update_manifest_and_get_download_size(
 
         endpoint_to_use = None
 
-        if validate_manifest:
-            # Check if crdc_instance_uuid is found in the index
-            if not all(merged_df["crdc_series_uuid_match"]):
-                missing_manifest_cp_cmds = merged_df.loc[
-                    ~merged_df["crdc_series_uuid_match"], "manifest_cp_cmd"
-                ]
-                missing_manifest_cp_cmds_str = f"The following manifest copy commands do not have any associated series in the index: {missing_manifest_cp_cmds.tolist()}"
-                raise ValueError(missing_manifest_cp_cmds_str)
+        # Check if any crdc_series_uuid are not found in the index
+        if not all(merged_df["crdc_series_uuid_match"]):
+            missing_manifest_cp_cmds = merged_df.loc[
+                ~merged_df["crdc_series_uuid_match"], "manifest_cp_cmd"
+            ]
+            logger.error(
+                "The following manifest copy commands are not recognized as referencing any associated series in the index.\n"
+                "This means either these commands are invalid, or they may correspond to files available in a release of IDC\n"
+                f"different from {self.get_idc_version()} used in this version of idc-index. The corresponding files will not be downloaded.\n"
+            )
+            logger.error("\n" + "\n".join(missing_manifest_cp_cmds.tolist()))
 
-            # Check if there are more than one endpoints
+        if validate_manifest:
+            # Check if there is more than one endpoint
             if len(merged_df["endpoint"].unique()) > 1:
                 raise ValueError(
-                    "Either GCS bucket path is invalid or manifest has a mix of GCS and AWS urls. If so, please use urls from one provider only"
+                    "Either GCS bucket path is invalid or manifest has a mix of GCS and AWS urls. "
                 )
 
             if (
diff --git a/tests/idcindex.py b/tests/idcindex.py
index e0a252ad..7e6c4a4b 100644
--- a/tests/idcindex.py
+++ b/tests/idcindex.py
@@ -461,6 +461,28 @@ def test_cli_download(self):
             )
             assert len(os.listdir(Path.cwd())) != 0
 
+    def test_prior_version_manifest(self):
+        c = IDCClient()
+        with tempfile.TemporaryDirectory() as temp_dir:
+            (
+                total_size,
+                endpoint_to_use,
+                temp_manifest_file,
+                list_of_directories,
+            ) = c._validate_update_manifest_and_get_download_size(
+                "./prior_version_manifest.s5cmd",
+                temp_dir,
+                True,
+                False,
+                IDCClient.DOWNLOAD_HIERARCHY_DEFAULT,
+            )
+
+            # TODO: once issue https://github.com/ImagingDataCommons/idc-index/issues/100
+            # is fully resolved, the manifest below should not be empty, and this test should be updated
+            # with count equal to 5
+            with open(temp_manifest_file) as file:
+                assert len(file.readlines()) == 0
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/tests/prior_version_manifest.s5cmd b/tests/prior_version_manifest.s5cmd
new file mode 100644
index 00000000..1c91a450
--- /dev/null
+++ b/tests/prior_version_manifest.s5cmd
@@ -0,0 +1,5 @@
+cp s3://idc-open-data/040fd3e1-0088-4bfd-8439-55e3c5d80a56/*  .
+cp s3://idc-open-data/04553d0f-1af9-414d-b631-cc31624aced5/*  .
+cp s3://idc-open-data/068346bf-16ef-4e45-87bf-87feb576a21c/*  .
+cp s3://idc-open-data/07908d47-5e85-45f3-9649-79c15f606f52/*  .
+cp s3://idc-open-data/099d180f-1d79-402d-abad-bfd8e2736b04/*  .