Hi there! I’m sorry to hear you're having trouble updating or accessing SongPop Classic on your Mac with OS X 10.15.7. Let’s get this sorted out so you can enjoy your game again.

First, could you tell me a bit more about your issue? For example:
- Do you see any error messages when you try to open or update the game?
- Did the app suddenly stop working or after an update attempt?
- Are you trying to update from the Mac App Store or via another method?
- And lastly, is your internet connection stable when you try this?

Meanwhile, here are some steps to try that often help with update or app access issues:

1. Check for Updates
Open the App Store on your Mac and go to the "Updates" tab. See if SongPop Classic shows up there and try to update it.

2. Restart Your Mac
Sometimes a reboot frees up system resources and resolves temporary glitches.

3. Clear App Cache and Restart
Though not straightforward on Mac apps, try deleting the app preferences:
- Go to Finder, hold “Option” and select “Go” → “Library”
- Navigate to Preferences and look for files named like the game’s bundle identifier (e.g., com.songpop...). Move those to trash (you can back them up first).
- Relaunch the app.

4. Reinstall SongPop Classic
If updating doesn’t work, try uninstalling the app completely and reinstalling fresh.
- Drag the app from Applications to Trash.
- Empty Trash.
- Then download and install the latest version from the App Store.
Be mindful that uninstalling might require you to log back in or re-link your account if you're using SongPop Plus or Facebook login.

Also, the SongPop Classic team announced a recent update with new content and resolved some crashes, so make sure you have the latest version installed1.

If these steps don’t help, it might be good to check if your subscription/payment is intact on their servers or if there’s an account issue. I can guide you on how to verify that or escalate if needed.

Let me know how it goes and if you encounter any new messages or behaviors. We’ll get this working for you! Are you comfortable trying these steps?