PHP Script Installation Fix

I need help to install a PHP script on my server. The code is already uploaded, but the installer does not start and I'm getting an "Internal Server Error" message.

Requirements:
- Expertise in PHP and server management
- Experience with troubleshooting installation errors
- Ability to resolve "Internal Server Error" issues quickly

Ideal Skills:
- PHP development
- Server configuration
- Error debugging

This task needs to be solved right away. Please ping me when you're available.