diff --git a/app/downloader.py b/app/downloader.py
index 49e032e..6fca726 100644
--- a/app/downloader.py
+++ b/app/downloader.py
@@ -3,6 +3,7 @@
 import time
 from math import inf
 from pathlib import Path
+import os
 
 import requests
 
@@ -47,7 +48,13 @@ def worker(self):
         else:
             # gets the size of the file
             self.curr = path.stat().st_size
-            start = self.getval('start') + self.curr
+            # add the old start size and the current size to get the new start size
+            start = self.getval("start") + self.curr
+            # corruption check to make sure parts are not corrupted
+            if start > end:
+                os.remove(path)
+                self.error.set()
+                print("corrupted file!")
 
         url = self.getval('url')
         if self.curr != self.getval('size'):
@@ -147,7 +154,7 @@ def download(self, url, filepath, num_connections, display, multithread):
                 # load the progress from the progress file
                 # the object_hook converts the key strings whose value is int to type int
                 progress = json.loads(json_file.read_text(), object_hook=lambda d: {
-                                      int(k) if k.isdigit() else k: v for k, v in d.items()})
+                                    int(k) if k.isdigit() else k: v for k, v in d.items()})
             segment = total / num_connections
             self._dic['total'] = total
             self._dic['connections'] = num_connections
diff --git a/app/maingui.py b/app/maingui.py
index 22f6952..4496ddf 100644
--- a/app/maingui.py
+++ b/app/maingui.py
@@ -8,7 +8,7 @@
 
 import clr
 from PyQt6.QtCore import (QObject, QRunnable, Qt, QThreadPool, pyqtSignal,
-                          pyqtSlot)
+                        pyqtSlot)
 from PyQt6.QtGui import QIcon
 from PyQt6.QtWidgets import QFileDialog, QMainWindow
 
@@ -18,7 +18,8 @@
 from url_gen import url_generator
 from utls import open_browser
 
-dll_path = os.path.abspath(r"data\System.Management.Automation.dll")
+script_dir = os.path.dirname(os.path.abspath(__file__))
+dll_path = os.path.join(script_dir,"data\System.Management.Automation.dll")
 clr.AddReference(dll_path)
 
 try:
@@ -62,7 +63,7 @@ class Worker(QRunnable):
     Inherits from QRunnable to handler worker thread setup, signals and wrap-up.
 
     :param callback: The function callback to run on this worker thread. Supplied args and
-                     kwargs will be passed through to the runner.
+                    kwargs will be passed through to the runner.
     :type callback: function
     :param args: Arguments to pass to the callback function
     :param kwargs: Keywords to pass to the callback function