Except ImportErrors induced by legacy run method

sherlock/__init__.py

@@ -5,6 +5,9 @@ networks.
 
 """
 
+# This variable is only used to check for ImportErrors induced by users running as script rather than as module or package
+importErrTestVar = None
+
 __shortname__   = "Sherlock"
 __longname__    = "Sherlock: Find Usernames Across Social Networks"
 __version__     = "0.14.4"

sherlock/sherlock.py

@@ -7,12 +7,21 @@ This module contains the main logic to search for usernames at social
 networks.
 """
 
+import sys
+
+try:
+    from sherlock.__init__ import importErrTestVar # noqa: F401
+except ImportError:
+    print("Did you run Sherlock with `python3 sherlock/sherlock.py ...`?")
+    print("This is an outdated method. Please see https://sherlockproject.xyz/installation for up to date instructions.")
+    print("Most users can simply run `pipx install sherlock-project`, but other options are detailed on the website.")
+    sys.exit(1)
+
 import csv
 import signal
 import pandas as pd
 import os
 import re
-import sys
 from argparse import ArgumentParser, RawDescriptionHelpFormatter
 from time import monotonic