Added an install_modpack function.

main.py

@@ -110,6 +110,30 @@ def backup_mods(modpack_dir, mods_backup_dir):
     else:
         print("No mods directory found. No backup required.")
 
+def install_modpack(modpack_url, modpack_dir):
+    print("Downloading modpack...")
+    try:
+        response = requests.get(modpack_url)
+        if response.status_code == 200:
+            print("Extracting modpack...")
+            modpack_zip = zipfile.ZipFile(BytesIO(response.content))
+            for member in modpack_zip.namelist():
+                filename = os.path.basename(member)
+                if not filename:
+                    continue
+
+                source = modpack_zip.open(member)
+                target = open(os.path.join(modpack_dir, filename), "wb")
+
+                with source, target:
+                    shutil.copyfileobj(source, target)
+
+            print("Modpack installed successfully.")
+        else:
+            print("Failed to download modpack. Please check the URL or your internet connection.")
+    except Exception as e:
+        print(f"An error occurred during modpack installation: {e}")
+
 # Entry point of the script.
 def main():
     try:
@@ -117,6 +141,7 @@ def main():
         install_forge(forge_dir, forge_url)
         install_forge_libraries(forge_libraries_dir, forge_libraries_url)
         backup_mods(modpack_dir, mods_backup_dir)
+        install_modpack(modpack_url, modpack_dir)
     except KeyboardInterrupt:
         print("\033[91m\nSession ended by user.\033[0m")
     except Exception as e: