Microsoft has upgraded Android 12 to Android 13 in the Windows Android Subsystem (WSA), but it’s currently only available to users of the Windows Insider channel.

Update WSA to Android 13
Users can update WSA’s Android 13 available build 2211.40000.11.0 from the Microsoft Store app. The new Android 13 version includes various performance improvements such as startup speed, mouse click input, clipboard stability, app resizing, media files, jump list entries, and more.
You do not need to have Windows 11 Dev Channel or Beta installed on your PC to upgrade WSA to Android 13. Here’s how to install it on a stable OS.
Way to Install Android 13 in Windows Subsystem for Android on Windows 11
1. Visit the page.
2. Paste the following URL into the text box.
http://www.microsoft.com/en-us/p/windows-subsystem-for-android/9p3395vx91nr
3. Click the drop-down menu and set it to RP Ring.
4. Click the checkbox, then website fetches the results from Microsoft’s server.
5. Find the msixbundle file 2211.40000.11.0 at the bottom of the page called
“MicrosoftCorporationII.WindowsSubsystemForAndroid_2211.40000.11.0_neutral_~_8wekyb3d8bbwe.msixbundle”
NOTE: You must enable virtualization in UEFI or BIOS, and enable Virtual Machine Platform and Windows Hypervisor Platform under Windows Features for WSA to work.

The Amazon AppStore application is automatically installed when you install WSA to download and install Android applications on your computer. But if you want to sideload apps, you need to follow the steps below.
Way to Sideload Android Apps on Windows 11
1 Enable developer mode in WSA. Please open Windows Subsystem for Android Settings, click Developer in the sidebar, and enable the toggle in the right pane. Remember the local IP address displayed on the page, we will need it later.
2 Get Android Debugging (ADB) working. Download the SDK Platform-Tools for Windows. You can find it on Google’s Android development portal. Extract the archive contents into a folder ( For example C:\platform-tools). Put the APK file of the app you want to install in the same directory.
3 Open a command prompt as an administrator and navigate to the location of platform-tools. input the command:
adb connect 127.0.0.1:58526
4 This will authenticate access to the Android’s Windows subsystem. Now you can install the application using the APK file using commond: adb install appname.apk.
For example, install F-droid store (put it in platform-tools folder), type the following command: adb install F-Droid.apk

After that, you can access it from the Start menu.
Conclusion
This article tells you how to install Android 13 on Windows 11 and sideload Android apps on Windows 11.