Troubleshooting the Installation Error 0x800F081F in SQL Server 2017

There are several ways to resolve this error code:

1. Install .NET Framework 3.5: This error can happen if .NET Framework 3.5 is missing. Install it by navigating to Control Panel > Programs and Features > Turn Windows features on or off > .NET Framework 3.5 (includes .NET 2.0 and 3.0).
2. Disable antivirus software: Sometimes, antivirus programs can disrupt the installation. Temporarily disable your antivirus and try reinstalling SQL Server 2017.
3. Use the installation media: If installing SQL Server 2017 from a download, use the installation media instead to avoid issues with the downloaded file.
4. Check system requirements: Ensure your system meets the minimum requirements for SQL Server 2017. Check Microsoft's website for the details.
5. Run the installation as an administrator: Right-click the installation file and choose 'Run as administrator' to bypass any permission issues.
6. Check the installation log: The installation log may have more details about the error. Find the log in %ProgramFiles%\Microsoft SQL Server`\Setup Bootstrap\Log. Look for any errors or warnings and try to fix them.