If you are trying to download the installer from the Slack website and it fails, follow these steps in order.
Check Storage SpaceSlack is a relatively lightweight app, but the download will fail if your phone has less than 500MB of free space. Delete a few large videos or unused apps and try again.
Which you are using (Windows 11, macOS, Android, etc.) slack can not download
Restart Your DeviceIt sounds simple, but a restart clears the temporary memory and resets the App Store’s download queue. This fixes about 50% of mobile download hangs.
If you see a (like 0x80073cf9 or "Download Failed") If you are on a company-managed network or home Wi-Fi If you are trying to download the installer
Reset App Store Cache (Android Only)On Android, go to Settings > Apps > Google Play Store > Storage and tap "Clear Cache" and "Clear Data." This forces the Play Store to refresh its connection and usually clears stuck downloads.
If you are in a rush and cannot get the app to download, remember that the Slack web client is nearly identical to the desktop app. Simply go to slack.com, sign in to your workspace, and use it in your browser. This is a perfect temporary workaround while you troubleshoot your system issues. Final Check: Is Slack Down? Which you are using (Windows 11, macOS, Android, etc
Manual Reinstall: If the update still fails, uninstall Slack entirely, restart your machine, and download the latest version directly from the Slack website rather than relying on the in-app updater. Alternative: Use Slack in Your Browser