Updating Unity Mobile Games Without Store Submissions: Addressables Migration & Memory Management (Part 3)

Welcome to Part 3 of our 3-Part Unity LiveOps & Dynamic Asset Update Masterclass:

• Part 1: Architecture, Store Compliance & AssetBundle Fundamentals →
• Part 2: C# Remote Download, Hash128 Versioning & Caching Pipeline →
• Part 3: Addressables Migration, Catalog Updates & Memory Unloading (This Guide)

While raw AssetBundles provide powerful dynamic downloads, managing raw bundle dependencies and manual reference counts can lead to memory leaks or broken references.

In this final guide, we upgrade from raw AssetBundles to Unity Addressables (com.unity.addressables), implement dynamic remote catalog updates (Addressables.UpdateCatalogs), and enforce zero-leak memory unloading.

1. Why Upgrade to Unity Addressables?

Addressables sit on top of AssetBundles but solve three critical low-level engineering pain points:

1. Automatic Dependency Resolution: Addressables track references between materials, textures, and prefabs across bundles.
2. Dynamic Remote Catalogs: Update game content by uploading a lightweight catalog file (catalog.json) to your CDN.
3. Reference-Counted Memory Lifecycle: Call Addressables.Release(handle) to automatically unload unused bundles from RAM.

2. Production Addressables Dynamic Update Manager

Below is a complete C# Addressables manager that checks for remote catalog updates at startup, downloads updated content, and instantiates remote prefabs dynamically:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AddressableAssets;
using UnityEngine.ResourceManagement.AsyncOperations;
using UnityEngine.ResourceManagement.ResourceProviders;

public class AddressablesLiveOpsManager : MonoBehaviour
{
    // =========================================================================
    // 1. CHECK & UPDATE REMOTE CATALOGS (LIVEOPS OVER-THE-AIR UPDATE)
    // =========================================================================
    public IEnumerator CheckForRemoteUpdates(System.Action<bool> onComplete)
    {
        Debug.Log("[Addressables LiveOps] Checking for remote catalog updates...");

        // Initialize Addressables
        var initHandle = Addressables.InitializeAsync();
        yield return initHandle;

        // Check for catalog updates on CDN
        var checkHandle = Addressables.CheckForCatalogUpdates(false);
        yield return checkHandle;

        if (checkHandle.Status == AsyncOperationStatus.Succeeded && checkHandle.Result.Count > 0)
        {
            List<string> catalogsToUpdate = checkHandle.Result;
            Debug.Log($"[Addressables LiveOps] Found {catalogsToUpdate.Count} catalog updates! Updating now...");

            // Download new remote catalog.json
            var updateHandle = Addressables.UpdateCatalogs(catalogsToUpdate, false);
            yield return updateHandle;

            Addressables.Release(updateHandle);
            onComplete?.Invoke(true); // Content updated!
        }
        else
        {
            Debug.Log("[Addressables LiveOps] Game is up to date!");
            onComplete?.Invoke(false);
        }

        Addressables.Release(checkHandle);
    }

    // =========================================================================
    // 2. LOAD & INSTANTIATE REMOTE PREFAB WITH MEMORY CLEANUP
    // =========================================================================
    private AsyncOperationHandle<GameObject> currentInstanceHandle;

    public IEnumerator LoadRemotePrefab(string addressableKey, Transform parentTransform)
    {
        AsyncOperationHandle<GameObject> handle = Addressables.InstantiateAsync(addressableKey, parentTransform);
        yield return handle;

        if (handle.Status == AsyncOperationStatus.Succeeded)
        {
            currentInstanceHandle = handle;
            Debug.Log($"[Addressables Success] Spawned '{addressableKey}' dynamically!");
        }
        else
        {
            Debug.LogError($"[Addressables Error] Failed to load key '{addressableKey}'");
        }
    }

    // =========================================================================
    // 3. UNLOAD ASSETS TO PREVENT MOBILE OOM CRASHES
    // =========================================================================
    public void ReleaseCurrentPrefab()
    {
        if (currentInstanceHandle.IsValid())
        {
            Addressables.ReleaseInstance(currentInstanceHandle);
            Debug.Log("[Addressables Memory] Released instance & freed RAM!");
        }
    }
}

3. Preventing Out-Of-Memory (OOM) Crashes on Low-Tier Mobile Devices

When updating assets live without restarting the game binary, memory management is vital:

• Always Call Addressables.Release() or Addressables.ReleaseInstance(): Leaving loaded Addressable handles unreleased keeps raw AssetBundle bytes pinned in RAM.
• Unload Unused Assets After Level Transitions:
  CSHARPCopy

  System.GC.Collect();
  Resources.UnloadUnusedAssets();
  

• Track Memory via Unity Profiler: Monitor AssetBundle allocations in the Memory Profiler to confirm zero stale asset leaks between levels.

4. Masterclass Series Recap

• Part 1: Understood Apple Guideline 2.5.2 & Google Play OTA rules, dynamic asset architecture, and C# AssetBundle Editor scripts.
• Part 2: Built a production C# RemoteAssetManager, utilized Hash128 caching, and streamed bundles over HTTPS with progress tracking.
• Part 3: Upgraded to Unity Addressables, implemented remote catalog updating, and enforced zero-leak memory management.

💡 Need a Custom LiveOps & Asset Delivery Strategy for Your Game?

Struggling with high binary sizes, long store review delays, or memory leaks during bundle loading? I work directly with game studios to architect scalable LiveOps and remote asset pipelines:

• OTA Remote Pipelines: Setting up AWS S3, Cloudflare R2, or Unity Cloud Content Delivery.
• Sub-150MB App Binary Setup: Deferring heavy game assets to post-install dynamic downloads.
• Addressables Migration: Upgrading legacy AssetBundle setups to zero-leak Addressables architectures.

👉 Book a LiveOps & Remote Architecture Session or reach out directly to discuss your game's engineering roadmap.

🎮 Shipped Mobile Games & Official Store Profiles

Explore live commercial titles built with Unity and published across official app stores:

• 🍏 Apple App Store Developer Profile
• 🤖 Google Play Developer Profile

Featured Live Titles:

• Pet Hero: Animal Hospital — App Store | Google Play
• Restaurant RUSH: Idle Tycoon — App Store | Google Play
• Bird Sort Mania — Google Play | Read AI Dev Breakdown

Planning to launch a mobile game or optimize your engineering budget? Check out our 2026 Mobile Game Development Cost Guide or book an engineering consultation.