diff --git a/CHANGELOG.md b/CHANGELOG.md
index ef78caa8..48256beb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ CHANGELOG for FlatCAM beta
 28.11.2020
 
 - updated the Italian translation (by Massimiliano Golfetto)
+- added the mechanism to create an error log in the data path where to write debug data for the crashes of FlatCAM
 
 27.11.2020
 
diff --git a/FlatCAM.py b/FlatCAM.py
index 3b5d2bdd..ff996cf5 100644
--- a/FlatCAM.py
+++ b/FlatCAM.py
@@ -1,5 +1,7 @@
 import sys
 import os
+import traceback
+from datetime import datetime
 
 from PyQt5 import QtWidgets
 from PyQt5.QtCore import QSettings, Qt
@@ -12,10 +14,10 @@ from multiprocessing import freeze_support
 
 if sys.platform == "win32":
     # cx_freeze 'module win32' workaround
-    pass
+    from win32comext.shell import shell, shellcon
 
 MIN_VERSION_MAJOR = 3
-MIN_VERSION_MINOR = 5
+MIN_VERSION_MINOR = 6
 
 
 def debug_trace():
@@ -35,24 +37,68 @@ if __name__ == '__main__':
     # NOTE: Never talk to the GUI from threads! This is why I commented the above.
     freeze_support()
 
+    portable = False
+    # Folder for user settings.
+    if sys.platform == 'win32':
+        # #######################################################################################################
+        # ####### CONFIG FILE WITH PARAMETERS REGARDING PORTABILITY #############################################
+        # #######################################################################################################
+        config_file = os.path.dirname(os.path.dirname(os.path.realpath(__file__))) + '\\config\\configuration.txt'
+        try:
+            with open(config_file, 'r'):
+                pass
+        except FileNotFoundError:
+            config_file = os.path.dirname(os.path.realpath(__file__)) + '\\config\\configuration.txt'
+
+        with open(config_file, 'r') as f:
+            for line in f:
+                param = str(line).replace('\n', '').rpartition('=')
+
+                if param[0] == 'portable':
+                    try:
+                        portable = eval(param[2])
+                    except NameError:
+                        portable = False
+
+        if portable is False:
+            data_path = shell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, None, 0) + '\\FlatCAM'
+        else:
+            data_path = os.path.dirname(os.path.dirname(os.path.realpath(__file__))) + '\\config'
+    else:
+        data_path = os.path.expanduser('~') + '/.FlatCAM'
+
+    if not os.path.exists(data_path):
+        os.makedirs(data_path)
+
+    log_file_path = os.path.join(data_path, "log.txt")
+
     major_v = sys.version_info.major
     minor_v = sys.version_info.minor
-    # Supported Python version is >= 3.5
-    if major_v >= MIN_VERSION_MAJOR:
-        if minor_v >= MIN_VERSION_MINOR:
-            pass
-        else:
-            print("FlatCAM BETA uses PYTHON 3 or later. The version minimum is %s.%s\n"
-                  "Your Python version is: %s.%s" % (MIN_VERSION_MAJOR, MIN_VERSION_MINOR, str(major_v), str(minor_v)))
 
-            if minor_v >= 8:
-                os._exit(0)
-            else:
-                sys.exit(0)
-    else:
-        print("FlatCAM BETA uses PYTHON 3 or later. The version minimum is %s.%s\n"
-              "Your Python version is: %s.%s" % (MIN_VERSION_MAJOR, MIN_VERSION_MINOR, str(major_v), str(minor_v)))
-        sys.exit(0)
+    v_msg = "FlatCAM Evo uses PYTHON 3 or later. The version minimum is %s.%s\n"\
+            "Your Python version is: %s.%s" % (MIN_VERSION_MAJOR, MIN_VERSION_MINOR, str(major_v), str(minor_v))
+
+    # Supported Python version is >= 3.6
+    if major_v < MIN_VERSION_MAJOR or (major_v >= MIN_VERSION_MAJOR and minor_v < MIN_VERSION_MINOR):
+        print(v_msg)
+        msg = '%s\n' % str(datetime.today())
+        msg += v_msg
+
+        try:
+            with open(log_file_path) as f:
+                log_file = f.read()
+            log_file += '\n' + msg
+
+            with open(log_file_path, 'w') as f:
+                f.write(log_file)
+        except IOError:
+            with open(log_file_path, 'w') as f:
+                f.write(msg)
+
+        if minor_v >= 8:
+            os._exit(0)
+        else:
+            sys.exit(0)
 
     debug_trace()
     VisPyPatches.apply_patches()
@@ -82,6 +128,26 @@ if __name__ == '__main__':
     else:
         QtWidgets.QApplication.setAttribute(Qt.AA_EnableHighDpiScaling, False)
 
+
+    def excepthook(exc_type, exc_value, exc_tb):
+        msg = '%s\n' % str(datetime.today())
+        msg += "".join(traceback.format_exception(exc_type, exc_value, exc_tb))
+
+        try:
+            with open(log_file_path) as f:
+                log_file = f.read()
+            log_file += '\n' + msg
+
+            with open(log_file_path, 'w') as f:
+                f.write(log_file)
+        except IOError:
+            with open(log_file_path, 'w') as f:
+                f.write(msg)
+        QtWidgets.QApplication.quit()
+        # or QtWidgets.QApplication.exit(0)
+
+    sys.excepthook = excepthook
+
     app = QtWidgets.QApplication(sys.argv)
     app.setAttribute(Qt.AA_UseHighDpiPixmaps)
 
@@ -92,5 +158,6 @@ if __name__ == '__main__':
         app.setStyle(style)
 
     fc = App(qapp=app)
+
     sys.exit(app.exec_())
     # app.exec_()
diff --git a/app_Main.py b/app_Main.py
index c3bfd817..502ef516 100644
--- a/app_Main.py
+++ b/app_Main.py
@@ -508,9 +508,6 @@ class App(QtCore.QObject):
             os.makedirs(self.data_path)
             self.log.debug('Created data folder: ' + self.data_path)
 
-            os.makedirs(os.path.join(self.data_path, 'preprocessors'))
-            self.log.debug('Created data preprocessors folder: ' + os.path.join(self.data_path, 'preprocessors'))
-
         self.preprocessorpaths = self.preprocessors_path()
         if not os.path.exists(self.preprocessorpaths):
             os.makedirs(self.preprocessorpaths)