diff --git a/cli.py b/cli.py
index 62c16f6..e4d2948 100644
--- a/cli.py
+++ b/cli.py
@@ -93,11 +93,6 @@ def parse_args(args):
             "products/bundle download page. Can set multiple"
         ),
     )
-    parser.add_argument(
-        "--rebuild-cache",
-        action="store_true",
-        help="Rebuild cache by checking all existing files in library",
-    )
 
     return parser.parse_args(args)
 
@@ -118,5 +113,4 @@ def cli():
         purchase_keys=cli_args.keys,
         trove=cli_args.trove,
         update=cli_args.update,
-        rebuild_cache=cli_args.rebuild_cache,
     ).start()
diff --git a/download_library.py b/download_library.py
index 458dd6b..fe55cc9 100644
--- a/download_library.py
+++ b/download_library.py
@@ -34,7 +34,6 @@ class DownloadLibrary:
         purchase_keys=None,
         trove=False,
         update=False,
-        rebuild_cache=False,
     ):
         self.library_path = library_path
         self.progress_bar = progress_bar
@@ -53,7 +52,6 @@ class DownloadLibrary:
         self.purchase_keys = purchase_keys
         self.trove = trove
         self.update = update
-        self.rebuild_cache = rebuild_cache
 
         self.session = requests.Session()
         if cookie_path:
@@ -73,12 +71,6 @@ class DownloadLibrary:
     def start(self):
         self.cache_file = os.path.join(self.library_path, ".cache.json")
         self.cache_data = self._load_cache_data(self.cache_file)
-
-        # If rebuild_cache is requested, clear the cache
-        if self.rebuild_cache:
-            logger.warning("Rebuilding cache from existing files...")
-            self.cache_data = {}
-
         self.purchase_keys = (
             self.purchase_keys if self.purchase_keys else self._get_purchase_keys()
         )
@@ -150,31 +142,19 @@ class DownloadLibrary:
                 # Do not care about checking for updates at this time
                 continue
 
-            # Determine file paths
-            product_folder = os.path.join(self.library_path, "Humble Trove", title)
-            local_filename = os.path.join(product_folder, web_name)
-
-            # If no cache entry exists, check if file physically exists
-            if cache_file_info == {}:
-                existing_file_mtime = self._file_exists_in_library(local_filename)
-                if existing_file_mtime is not None and self.update is not True:
-                    logger.info(
-                        "Trove file exists but not in cache, adding to cache: {filename}".format(
-                            filename=web_name
-                        )
-                    )
-                    # Add to cache with current file info
-                    self._update_cache_data(cache_file_key, file_info)
-                    continue
-
             if file_info["uploaded_at"] != cache_file_info.get(
                 "uploaded_at"
             ) and file_info["md5"] != cache_file_info.get("md5"):
+                product_folder = os.path.join(self.library_path, "Humble Trove", title)
                 # Create directory to save the files to
                 try:
                     os.makedirs(product_folder)
                 except OSError:
                     pass
+                local_filename = os.path.join(
+                    product_folder,
+                    web_name,
+                )
                 signed_url = self._get_trove_download_url(
                     download["machine_name"],
                     web_name,
@@ -472,21 +452,6 @@ class DownloadLibrary:
             # Do not care about checking for updates at this time
             raise FileExistsError
 
-        # If no cache entry exists, check if file physically exists
-        local_file = os.path.join(local_folder, local_filename)
-        if cache_file_info == {}:
-            existing_file_mtime = self._file_exists_in_library(local_file)
-            if existing_file_mtime is not None and self.update is not True:
-                logger.info(
-                    "File exists but not in cache, adding to cache: {filename}".format(
-                        filename=local_filename
-                    )
-                )
-                # Add to cache with file modification time
-                file_info = {"url_last_modified": existing_file_mtime}
-                self._update_cache_data(cache_file_key, file_info)
-                raise FileExistsError
-
         try:
             remote_file_r = self.session.get(remote_file, stream=True)
         except Exception:
@@ -635,16 +600,6 @@ class DownloadLibrary:
 
         return cache_data
 
-    def _file_exists_in_library(self, local_file):
-        """
-        Check if a file exists in the library and return its modification time
-        formatted as HTTP Last-Modified header if it does.
-        """
-        if os.path.isfile(local_file):
-            mtime = os.path.getmtime(local_file)
-            return time.strftime("%a, %d %b %Y %H:%M:%S GMT", time.gmtime(mtime))
-        return None
-
     def _get_purchase_keys(self):
         try:
             library_r = self.session.get("https://www.humblebundle.com/home/library")
diff --git a/humblebundle-download.py b/humblebundle-download.py
index 1d59dac..bc603bc 100644
--- a/humblebundle-download.py
+++ b/humblebundle-download.py
@@ -102,11 +102,6 @@ def parse_args(args):
             "products/bundle download page. Can set multiple"
         ),
     )
-    parser.add_argument(
-        "--rebuild-cache",
-        action="store_true",
-        help="Rebuild cache by checking all existing files in library",
-    )
 
     return parser.parse_args(args)
 
@@ -127,7 +122,6 @@ def main():
         purchase_keys=cli_args.keys,
         trove=cli_args.trove,
         update=cli_args.update,
-        rebuild_cache=cli_args.rebuild_cache,
     ).start()