Hi there,

Thank you for reaching out. I understand you're experiencing issues updating SP Page Builder on your XAMPP-based website, resulting in an error 500. Please enable the debug mode and error reporting.

To assist you better, could you provide more details about the specific steps you've taken so far? Additionally, if there are any error messages or logs associated with the 500 error, sharing that information would be helpful.

In the meantime, make sure to create a backup of your website before attempting any further updates or troubleshooting. This ensures you can restore your site to its previous state if needed.

Once you provide more information, I'll do my best to guide you through resolving the update issue.

-Thanks