diff --git a/unreal_mod_manager/src/error.rs b/unreal_mod_manager/src/error.rs
index 9bb2b7c..764cdc3 100644
--- a/unreal_mod_manager/src/error.rs
+++ b/unreal_mod_manager/src/error.rs
@@ -105,6 +105,7 @@ pub enum ModLoaderWarningKind {
 
     MissingMetadata,
     InvalidMetadata,
+    OutdatedSource,
     InvalidModId,
     InvalidModFileName,
     InvalidVersion,
@@ -176,6 +177,12 @@ impl ModLoaderWarning {
             mod_id: Some(mod_id),
         }
     }
+    pub fn outdated_source(mod_id: String) -> Self {
+        ModLoaderWarning {
+            kind: ModLoaderWarningKind::OutdatedSource,
+            mod_id: Some(mod_id),
+        }
+    }
     pub fn invalid_mod_id(mod_id: String) -> Self {
         ModLoaderWarning {
             kind: ModLoaderWarningKind::InvalidModId,
@@ -259,6 +266,7 @@ impl fmt::Display for ModLoaderWarning {
 
             ModLoaderWarningKind::MissingMetadata => format!("{mod_name}Missing metadata"),
             ModLoaderWarningKind::InvalidMetadata => format!("{mod_name}Invalid metadata"),
+            ModLoaderWarningKind::OutdatedSource => format!("{mod_name}mod was obtained from an outdated source (e.g. astroneermods.space) and cannot be loaded in-game"),
             ModLoaderWarningKind::InvalidModId => format!("{mod_name}Invalid mod ID"),
             ModLoaderWarningKind::InvalidModFileName => {
                 format!("{mod_name}Invalid mod file name")
diff --git a/unreal_mod_manager/src/mod_processing/pakfile_reading.rs b/unreal_mod_manager/src/mod_processing/pakfile_reading.rs
index 35ee4c9..08c1fbd 100644
--- a/unreal_mod_manager/src/mod_processing/pakfile_reading.rs
+++ b/unreal_mod_manager/src/mod_processing/pakfile_reading.rs
@@ -12,6 +12,8 @@ use crate::{FileToProcess, ModLoaderAppData};
 
 use super::verify::{self, MOD_FILENAME_REGEX};
 
+const OUTDATED_SOURCE_URLS: &[&str] = &["astromod.space", "astroneermods.space", "atenfyr.com/ams-archive"];
+
 #[derive(Debug)]
 pub(crate) struct ReadData(String, Metadata);
 
@@ -56,6 +58,15 @@ pub(crate) fn read_pak_files(
                 return Err(ModLoaderWarning::invalid_mod_file_name(file_name));
             }
 
+            // check that homepage doesn't contain outdated source URL
+            if let Some(ref homepage) = metadata.homepage {
+                let homepage_lower = homepage.to_lowercase();
+                if OUTDATED_SOURCE_URLS.iter().any(|banned| homepage_lower.contains(banned))
+                {
+                    return Err(ModLoaderWarning::outdated_source(file_name));
+                }
+            }
+
             let file_name_parts = MOD_FILENAME_REGEX
                 .captures(&file_name)
                 .ok_or_else(|| ModLoaderWarning::invalid_metadata(file_name.clone()))?;