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How to Install Castle APK on Firestick & Fire TV (2026 Step-by-Step Guide)

Updated: October 2026 5 min read Verified Guide

Want to stream your favorite movies and live TV channels on your big screen? Installing Castle APK on an Amazon Firestick or Fire TV is one of the best ways to enjoy high-definition entertainment.

Since the app is not officially available on the Amazon Appstore, you need to sideload it using the Downloader app. Follow this easy, step-by-step tutorial to get it set up in under 5 minutes!

Ready to Get Started?

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01 Step 1: Enable Apps from Unknown Sources

Before downloading any APK file, your Firestick needs permission to install apps from outside the Amazon Appstore:

Settings

Select My Fire TV (or Device & Software).
Click on Developer Options. *(If you don't see this, go to About -> click your Fire TV Stick name 7 times until it says "You are already a developer")*.
Turn ON Install Unknown Apps for the Downloader app.

02 Step 2: Install the "Downloader" App

The Downloader app by AFTVnews is the safest tool for sideloading APKs on Fire TV:

Go to the Find / Search tab on your Firestick home screen.
Type Downloader and select the orange icon app.
Click Download / Get to install it.

03 Step 3: Download & Install Castle APK

Now you can download the application directly:

Open the Downloader app you just installed.
In the URL input box, enter your website main link or direct download link, or visit castleapptv.co.in.
Click Download APK and wait for the file to finish downloading.
Click Install when prompted. Once finished, click Open or Delete the installer package to save space.

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