Press Enter, type your password, and wait for the process to complete. Final Thoughts on High Sierra

The best way to obtain a clean installer is directly from Apple’s repositories. Official Apple Support Link: direct App Store link

Your Mac will open the Software Update menu. Confirm the prompt to begin downloading.

The safest way to is surprisingly still via Apple’s hidden support page.

Last OS to natively support 32-bit apps flawlessly, APFS storage engine. Step 1: Official Apple Download Links (Safe & Secure)

Using a macOS High Sierra 10.13 DMG is the best way to breathe new life into an aging Mac. By utilizing APFS and Metal 2, your hardware will feel faster and more responsive than it did on older versions of OS X. Always ensure you back up your data via Time Machine before performing any major OS installation. If you'd like to move forward, let me know: What are you using?

Compatibility Check: For Mac models from late 2009 to 2017