Spotify error code 18 occurs during desktop installation due to ongoing processes in the background, preventing installation.
Methods to resolve error code 18 include installing Spotify from Microsoft Store, closing Spotify processes from Task Manager, deleting registry keys using CCleaner.
System Cleanup in Windows 10 and checking for Steam client running also helps fix the issue.
Deleting app data, booting in and out of Safe Mode, and installing Spotify in Safe Mode are additional troubleshooting steps.
Running Spotify installer in Safe Mode can also resolve the error.
A simple restart or changes in system configuration may also fix Spotify error code 18.