A "nulled" module is a premium, paid plugin that has been illegally modified. Hackers remove the license verification code and redistribution protections. This allows users to download and install copyrighted software for free. The Hidden Risks of Using Nulled PrestaShop Modules

Using a "prestashop multi vendor nulled 25" script might save you money today, but it will cost you your business tomorrow. Security, customer trust, and reliable software updates are the foundation of any successful online marketplace. Invest in official, licensed modules to protect your brand, your vendors, and your customers.

I strongly advise against using nulled software. Here is a review of the risks and why it is better to choose legitimate alternatives: The Risks of Using Nulled Modules Security Vulnerabilities : Nulled software often contains malicious code

Follow these steps to build a successful, secure marketplace: