Four quick checks fix most problems. Answer each one and the fix appears under the step that needs it.
Nothing shows on my profile
Check that the Discord desktop app is running, that AudioTwizz shows presence as on, and that Discord's Activity Privacy setting allows sharing your activity. You also can't see some details on your own profile, so ask a friend to look.
It says "Add your Application ID"
No Application ID is saved yet. Paste it in Settings and press Save first.
It says "Waiting for Discord to open"
AudioTwizz can't find the Discord desktop app. Open Discord, and AudioTwizz connects on its own a few seconds later.
It says "Presence is off"
AudioTwizz isn't sending your status right now. Switch presence back on in the app.
It says it couldn't upload the cover
None of the image hosts answered. Your status still works without a cover, and it tries again on the next song. You can also turn off cover upload in Settings.
It says "Invalid Application ID"
The ID is wrong. Copy it again from General Information in the Developer Portal. It must be digits only, with no spaces.
Do I need Python?
The installer looks for a compatible Python and installs one for you if it can't find it. This happens once.
Does it work with Spotify and my browser?
Yes. Anything that reports to the Windows media controls works, and streaming songs get a button that opens the song.
Can I hide my status?
Yes. Press Ctrl+Alt+H, or set it to hide automatically while certain apps run, in fullscreen, or at set quiet hours.
How do updates work?
AudioTwizz checks for a new version on start and every six hours, asks before installing, then closes and reopens by itself. You never need to download the installer again.
Can I go back to an older version?
Yes. Open Settings, then About, press Go back to an older version, and pick any earlier version. Your settings are backed up first, and AudioTwizz won't offer the newer version again until you check for updates yourself.
How do I remove it?
Run AudioTwizzUninstall.exe from the download section above.