Resolving SQL Server 2017 Installation Error 0x800F081F

Addressing error code 0x800F081F involves a few strategic fixes:

1. Enable .NET Framework 3.5: This error might occur because .NET Framework 3.5 isn't active on your computer. Activate it via Control Panel > Programs and Features > Turn Windows features on or off > Check .NET Framework 3.5 (includes .NET 2.0 and 3.0).
2. Turn off antivirus software: At times, antivirus programs may disrupt the installation. Temporarily disabling your antivirus might help in successfully installing SQL Server 2017.
3. Opt for installation media: If issues arise from a downloaded setup file, using physical installation media could be more reliable.
4. Verify system compatibility: Ensure that your computer aligns with the minimum requirements for SQL Server 2017, available on the Microsoft website.
5. Execute as an administrator: To sidestep permission barriers, right-click the setup file and select 'Run as administrator'.
6. Consult the installation log: For further clues on the error, check the installation log located in %ProgramFiles%\Microsoft SQL Server`\Setup Bootstrap\Log. Review any warning or error messages and address them accordingly.