Hello! I understand your Jacquie Lawson Advent Calendar app says updates are available, you update it, but then it won’t open. Let’s get this sorted out together.

First, can you tell me a bit more?
- Does the app show any error message when you try to open it after the update?
- Did you update it via the app itself or through a different method?
- Are you running the app with administrative privileges on your Windows 10 machine?

While I wait for that info, here are some straightforward steps to try that often fix this type of issue on Windows 10:

1. Run as Administrator: Right-click the app icon and choose “Run as administrator.” Sometimes apps need extra permissions after an update.
2. Restart Your PC: A quick reboot can clear update process hangs or locked files.
3. Check for System Updates: Go to Settings > Update & Security > Windows Update and make sure your system is fully updated.

If these don't work, the next step is a hard reinstall of the Advent Calendar app:
- Uninstall the current app via Control Panel > Programs and Features.
- Download the latest version from the official Jacquie Lawson site and install it anew.
- Make sure you launch it as administrator for the first time.

Additionally, make sure your Windows account has administrator privileges, as the app requires that to function properly on Windows 101.

Try these and let me know what happens or if you see any messages. I’m here to help you through each step! Are you satisfied with this initial approach?