Is the Windows 10 Pro operating system pre-installed, or do I need to install it myself?

The product comes with Windows 10 Pro pre-installed.

Can the 4GB RAM in this mini PC be upgraded in the future if I need more memory?

Yes, the maximum memory supported is 32 GB, indicating that the 4GB RAM can be upgraded in the future.

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ASUS PN50 Mini PC, AMD Ryzen 5 4500U Upto 4.0GHz, 4GB RAM, 256GB NVMe SSD, HDMI, DisplayPort, Card Reader, Wi-Fi, Bluetooth, Windows 10 Pro