Choose correct installer version regardless of spec (ZekerZhayard#9)

Author: Pierce01

src/main/java/io/github/zekerzhayard/forgewrapper/installer/Installer.java

@@ -1,12 +1,14 @@
 package io.github.zekerzhayard.forgewrapper.installer;
 
 import java.io.File;
+import java.lang.reflect.Method;
 
 import io.github.zekerzhayard.forgewrapper.installer.util.AbstractInstaller;
 import io.github.zekerzhayard.forgewrapper.installer.util.InstallerV0;
 import io.github.zekerzhayard.forgewrapper.installer.util.InstallerV1;
 import net.minecraftforge.installer.actions.ProgressCallback;
 import net.minecraftforge.installer.json.Install;
+import net.minecraftforge.installer.json.Util;
 
 public class Installer {
     public static boolean install(File libraryDir, File minecraftJar, File installerJar, int installerSpec) {
@@ -26,7 +28,18 @@ public static boolean install(File libraryDir, File minecraftJar, File installer
 
     private static AbstractInstaller getInstaller(int installerSpec) {
         switch (installerSpec) {
-            case 0: return new InstallerV0();
+            case 0: {
+                Boolean isV1 = false;
+                Method[] methods = Util.class.getDeclaredMethods();
+                for (Method method: methods) {
+                    String methodName = method.toString();
+                    if (methodName.contains("InstallV1") && methodName.contains("loadInstallProfile")) {
+                        isV1 = true;
+                        break;
+                    }
+                }
+                return isV1 ? new InstallerV1() : new InstallerV0();
+            }
             case 1: return new InstallerV1();
             default: throw new IllegalArgumentException("Invalid installer profile spec: " + installerSpec);
         }