Hi there! I understand you're having trouble with downloading the Planet Fitness app and then creating an account after restarting your phone. Let's get to the bottom of this together.

To start, could you let me know which device you're using to download the app? Is it on a smartphone (iOS or Android), or are you trying to use a Windows device or something else? That will help me guide you more precisely.

Meanwhile, here are some common steps to try, especially on a phone:

1. Check Storage and Connection: Ensure your device has enough free storage space for the app and that your internet connection is stable (Wi-Fi or cellular).

2. Clear App Store Cache or Data: If you're on Android, clear the Google Play Store cache and data; for iOS, try restarting the App Store app.

3. Delete and Reinstall App: You've mentioned you had it download and restart, but if you haven't tried deleting the app completely and reinstalling fresh, that’s worth doing.

4. Update Device OS: Make sure your device’s operating system is fully updated; compatibility issues can sometimes block installations or app functions.

Regarding the inability to create an account after opening the app, this could be due to a few reasons:

- Server issues or app bugs that temporarily block account setup.
- Network restrictions or VPN/proxy interference.
- An existing account conflict (like trying to reuse an email already registered).

As a more targeted suggestion for Windows 10 and WebKit browser context (assuming you're possibly trying to use the app web version on your PC), the app itself might not fully function on Windows since it’s primarily a mobile app. However, you can manage memberships and account creation via the official Planet Fitness website here: https://www.planetfitness.com/login

If app issues persist on mobile, try these next steps:

- Update the app to the latest version available.
- Try creating an account directly on the website and then log in on the app. Some users have reported the app doesn’t allow new registrations, but website sign-up works fine.
- Temporarily disable VPN or any ad-blockers that might interfere with app communication.

If you've already done these or have more specific details (device type, error messages when creating the account), please share them so I can tailor the support better.

Also, if this seems like a wider app issue affecting many users, I can look further into current reports and possible server outages.

Are you satisfied with this guidance so far? If not, we can try deeper troubleshooting steps next!