diff --git a/meta/common/__init__.py b/meta/common/__init__.py
index d7ee49a..16a4f50 100644
--- a/meta/common/__init__.py
+++ b/meta/common/__init__.py
@@ -86,3 +86,12 @@ def default_session():
     sess.headers.update({"User-Agent": "PrismLauncherMeta/1.0"})
 
     return sess
+
+
+def remove_files(file_paths):
+    for file_path in file_paths:
+        try:
+            if os.path.isfile(file_path):
+                os.remove(file_path)
+        except Exception as e:
+            print(e)
diff --git a/meta/run/update_forge.py b/meta/run/update_forge.py
index 8fc8920..5a86727 100755
--- a/meta/run/update_forge.py
+++ b/meta/run/update_forge.py
@@ -16,7 +16,12 @@
 
 from pydantic import ValidationError
 
-from meta.common import upstream_path, ensure_upstream_dir, default_session
+from meta.common import (
+    upstream_path,
+    ensure_upstream_dir,
+    default_session,
+    remove_files,
+)
 from meta.common.forge import (
     JARS_DIR,
     INSTALLER_INFO_DIR,
@@ -292,6 +297,19 @@ def main():
                 UPSTREAM_DIR + "/forge/version_manifests/%s.json" % version.long_version
             )
 
+            if not os.path.isfile(jar_path):
+                remove_files([profile_path, installer_info_path])
+            else:
+                fileSha1 = filehash(jar_path, hashlib.sha1)
+                try:
+                    rfile = sess.get(version.url() + ".sha1")
+                    rfile.raise_for_status()
+                    if fileSha1 != rfile.text.strip():
+                        remove_files([jar_path, profile_path, installer_info_path])
+                except Exception as e:
+                    eprint("Failed to check sha1 %s" % version.url())
+                    eprint("Error is %s" % e)
+
             installer_refresh_required = not os.path.isfile(
                 profile_path
             ) or not os.path.isfile(installer_info_path)
diff --git a/meta/run/update_neoforge.py b/meta/run/update_neoforge.py
index 60b94ec..c6eb0f3 100644
--- a/meta/run/update_neoforge.py
+++ b/meta/run/update_neoforge.py
@@ -17,7 +17,12 @@
 
 from pydantic import ValidationError
 
-from meta.common import upstream_path, ensure_upstream_dir, default_session
+from meta.common import (
+    upstream_path,
+    ensure_upstream_dir,
+    default_session,
+    remove_files,
+)
 from meta.common.neoforge import (
     JARS_DIR,
     INSTALLER_INFO_DIR,
@@ -243,6 +248,19 @@ def main():
             UPSTREAM_DIR + "/neoforge/version_manifests/%s.json" % version.long_version
         )
 
+        if not os.path.isfile(jar_path):
+            remove_files([profile_path, installer_info_path])
+        else:
+            fileSha1 = filehash(jar_path, hashlib.sha1)
+            try:
+                rfile = sess.get(version.url() + ".sha1")
+                rfile.raise_for_status()
+                if fileSha1 != rfile.text.strip():
+                    remove_files([jar_path, profile_path, installer_info_path])
+            except Exception as e:
+                eprint("Failed to check sha1 %s" % version.url())
+                eprint("Error is %s" % e)
+
         installer_refresh_required = not os.path.isfile(
             profile_path
         ) or not os.path.isfile(installer_info_path)