How to fix “Package was not found. [ERROR_INSTALL_PACKAGE_NOT_FOUND (0x3CF1)]” – Error Code 15601


Error Code 15601

Error code Error Code 15601 is a common Windows issue that typically arises from “Package was not found. [ERROR_INSTALL_PACKAGE_NOT_FOUND (0x3CF1)]”.


In this article, we’ll focus on resolving the issue described as: “Package was not found. [ERROR_INSTALL_PACKAGE_NOT_FOUND (0x3CF1)]”. This error, identified by the error code Error Code 15601, can impede your system’s performance, and here’s how you can fix it.

Identifying the Problem

Error Code 15601 typically occurs during Windows installation or update processes. It indicates that an essential system component or package necessary for the installation or update operation is missing or corrupt. The underlying cause can vary, but it often stems from incomplete downloads, corrupted installation files, or system configuration issues.

Common Fixes

1. Restart the Installation or Update Process
Restarting the installation or update process can sometimes resolve the issue. The new attempt may successfully fetch the missing package or correct any transient errors that hindered the initial process.

2. Run the System File Checker (SFC)
SFC is a built-in Windows tool that scans for and repairs corrupted system files. Run it with elevated privileges by opening Command Prompt (cmd) as an administrator and entering:
sfc /scannow

3. Check Windows Update Logs
Windows Update logs can provide detailed information about the installation or update process and any encountered errors. Navigate to:

4. Reset Windows Update Components
Resetting Windows Update components can resolve corrupted cache and configuration issues. Open Command Prompt (cmd) as an administrator and enter the following commands:
net stop wuauserv
net stop cryptSvc
net stop bits
ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old
net start wuauserv
net start cryptSvc
net start bits

Advanced Troubleshooting

1. Disable Antivirus and Firewall
Antivirus software or firewall can sometimes interfere with the Windows Update process. Temporarily disable them and attempt the update again.

2. Check Disk Space and Permissions
Ensure there’s sufficient free disk space on the drive where Windows is installed. Also, check that your user account has administrative privileges.

3. Manually Download and Install the Package
If the missing package is known, you can try manually downloading and installing it from the Microsoft Update Catalog website:


By following the steps outlined above, you should be able to resolve Error Code 15601 and proceed with the Windows installation or update process. To prevent this issue in the future, keep your system updated, run regular maintenance tasks, and ensure you have a stable internet connection during updates.