2 files changed, 23 insertions, 5 deletions
diff --git a/src/main/java/io/github/zekerzhayard/forgewrapper/installer/Main.java b/src/main/java/io/github/zekerzhayard/forgewrapper/installer/Main.java
index f15a2a842c..2c0f4cfc29 100644
--- a/src/main/java/io/github/zekerzhayard/forgewrapper/installer/Main.java
+++ b/src/main/java/io/github/zekerzhayard/forgewrapper/installer/Main.java
@@ -10,7 +10,6 @@ import java.util.Map;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
-import cpw.mods.modlauncher.Launcher;
 import io.github.zekerzhayard.forgewrapper.installer.detector.DetectorLoader;
 import io.github.zekerzhayard.forgewrapper.installer.detector.IFileDetector;
 import io.github.zekerzhayard.forgewrapper.installer.util.ModuleUtil;
@@ -47,7 +46,6 @@ public class Main {
 
         try (URLClassLoader ucl = URLClassLoader.newInstance(new URL[] {
             Main.class.getProtectionDomain().getCodeSource().getLocation(),
-            Launcher.class.getProtectionDomain().getCodeSource().getLocation(),
             installerJar.toUri().toURL()
         }, ModuleUtil.getPlatformClassLoader())) {
             Class<?> installer = ucl.loadClass("io.github.zekerzhayard.forgewrapper.installer.Installer");
diff --git a/src/main/java/io/github/zekerzhayard/forgewrapper/installer/detector/IFileDetector.java b/src/main/java/io/github/zekerzhayard/forgewrapper/installer/detector/IFileDetector.java
index 1d3fb1f274..fc5f320539 100644
--- a/src/main/java/io/github/zekerzhayard/forgewrapper/installer/detector/IFileDetector.java
+++ b/src/main/java/io/github/zekerzhayard/forgewrapper/installer/detector/IFileDetector.java
@@ -1,12 +1,11 @@
 package io.github.zekerzhayard.forgewrapper.installer.detector;
 
+import java.net.URL;
 import java.net.URISyntaxException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.HashMap;
 
-import cpw.mods.modlauncher.Launcher;
-
 public interface IFileDetector {
     /**
      * @return The name of the detector.
@@ -29,7 +28,28 @@ public interface IFileDetector {
             return Paths.get(libraryDir).toAbsolutePath();
         }
         try {
-            Path launcher = Paths.get(Launcher.class.getProtectionDomain().getCodeSource().getLocation().toURI());
+            URL launcherLocation = null;
+            String[] classNames = {
+                "cpw.mods.modlauncher.Launcher",
+                "net.neoforged.fml.loading.FMLLoader"
+            };
+
+            for (String className : classNames) {
+                try {
+                    Class<?> clazz = Class.forName(className);
+                    // Return the location of the loaded class
+                    if (clazz.getProtectionDomain().getCodeSource() != null) {
+                        launcherLocation = clazz.getProtectionDomain().getCodeSource().getLocation();
+                    }
+                } catch (ClassNotFoundException e) {
+                    // ignore and try next
+                }
+            }
+
+            if (launcherLocation == null) {
+                    throw new UnsupportedOperationException("Could not detect the libraries folder - it can be manually specified with `-Dforgewrapper.librariesDir=` (Java runtime argument)");
+            }
+            Path launcher = Paths.get(launcherLocation.toURI());
 
             while (!launcher.getFileName().toString().equals("libraries")) {
                 launcher = launcher.getParent();