Troubleshooting for apps cannot be installed on the Mi Smart Projector, please refer to the following steps:
1. Make sure your projector is connected to the internet properly. Poor network connectivity can stop apps from downloading and installing;
2. Sometimes, restarting your projector can fix temporary software problems causing installation issues. Turn off your projector, wait a few seconds, then turn it back on;
3. If the problem keeps happening, try clearing the cache and data of the app store or the specific app you're installing. Go to your projector's settings menu, find the Apps section, select the app or app store, and choose to clear cache and data;
4. Check if your projector has enough storage space for new apps. You can free up space by uninstalling unused apps or deleting unnecessary files and media;
5. Make sure your projector's software is up to date. Look for any available software updates in the settings menu and install them if needed. Updates often include fixes and improvements that can help with installation issues;
6. As a last resort, you can do a factory reset on your projector to go back to its original settings. Remember, this erases all data and settings, so back up anything important first;
7. If the issue persists, contact your local after-sales for further assistance regarding this issue.