ERROR_INSTALL_POLICY_FAILURE - 15615 (0x3CFF)
To install this application you need either a Windows developer license or a sideloading-enabled system.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_INSTALL_POLICY_FAILURE with the numeric value 15615 and hexadecimal representation 0x3CFF is returned when an attempt to install a Windows application fails due to policy restrictions. Specifically, this error indicates that either a developer license or sideloading must be enabled for the installation to proceed.
Error Details
This error typically occurs during the installation process of applications that are not signed with a trusted certificate and are intended for development purposes only. The system enforces these policies to ensure security and compliance with Microsoft's guidelines, particularly in environments where sideloading is necessary for testing or development scenarios.
Usage Context
The context in which this error might occur includes:
- Installation of unsigned applications
- Attempts to install applications on systems that do not have a valid developer license or sideloading enabled
- Deployment of applications in enterprise environments with specific security policies
Developer Interpretation
Developers should be aware that this error is indicative of policy restrictions and not technical issues such as invalid parameters, file corruption, or resource limitations. The application must either obtain a Windows developer license from Microsoft or ensure that the system is configured to allow sideloading.
Related Errors
ERROR_FILE_NOT_FOUND(2)ERROR_ACCESS_DENIED(5)ERROR_INSUFFICIENT_BUFFER(122)
FAQ
Q: What does this error mean?
A: This error indicates that the installation of an application requires a Windows developer license or sideloading to be enabled.
Q: How can I resolve this issue?
A: Ensure that you have a valid Windows developer license, or configure your system to allow sideloading. For enterprise environments, consult with your IT administrator for proper configuration.
Summary
The ERROR_INSTALL_POLICY_FAILURE error (15615) is a generic reference indicating policy restrictions on application installation in Windows. It requires either a developer license from Microsoft or enabling sideloading to proceed with the installation.