Hi! I understand you're having trouble accessing the Mi Sanitas app after downloading it. Let's work together to get this sorted out.

First, could you tell me a bit more about what happens when you try to open the app? For example:
- Does the app fail to open at all, or does it open but you cannot log in?
- Are you seeing any error messages or unusual behavior?
- Have you already tried restarting your device or reinstalling the app?

With these details, I can guide you through the best steps to fix this. Meanwhile, here are some initial things you can try on your Windows device with the WebKit browser:

1. Ensure the app installed completely without interruption.
2. Check if your device meets any minimum software requirements for the app.
3. Restart your computer to clear any temporary glitches.
4. Try launching the app again after the restart.

If the app opens but you cannot log in, please make sure you are entering the correct username and password. If you have not yet created an account, you will need to do so first. The Mi Sanitas service requires registration to access personal medical records and appointments.

Let me know what you observe and any error messages so I can help further! If needed, I can guide you on clearing app cache/settings or checking for updates from the official source.

Are you satisfied with these initial directions?