Hi there! Thanks for reaching out. I understand you've paid for the Fit.me subscription and downloaded the app on your Mac, but you're not seeing any option to log in. Let's get this sorted out.

Could you please tell me a bit more? For example:
- When you open the app, what exactly do you see on the screen?
- Is there any prompt, button, or menu visible related to account or subscription?
- Did you subscribe via the app itself or through an external platform like the App Store?

Meanwhile, here’s a simple checklist to start:

1. Confirm that the app you downloaded is the official Fit.me app from the Mac App Store.
2. Make sure the app version is the latest available for OS X 10.15.7.
3. Some apps use the Apple ID subscription automatically. So, instead of logging in, the app may check your purchase history in the background.
4. Please check your Mac’s App Store under your account’s subscriptions to confirm the Fit.me subscription is active there.
5. Sometimes, restarting the app or the computer can trigger the login or subscription recognition features.

If after the above you still don’t see login option or subscription access, it could be that the app recognizes your subscription tied to your Apple ID without requiring manual login.

Could you check if the app is asking to pay again? Sometimes that happens if the subscription isn't linked properly.

Let me know your observations, and we can proceed with deeper checks or other fixes!