Prestashop error 500 in previous versions

[Admin]

In addition to what has been said before about the PHP versions.

We regularly get messages here about Printful, there actually was one just yesterday. Most people try to use it with WooCommerce: WooCommerce Printful Webhook Blocked by mod_security

But the answer is always the same: it will not work due to free hosting restrictions. Printful needs to call webhooks on your site to work, but they are blocked by this security system:

Browser Security System - Features and Limitations

InfinityFree uses a security system on all free hosting accounts to ensure your website is accessed by real web browsers, not bots or automated scripts. While this protects your site from malicious traffic, it can affect certain types of access. How the security system works The system checks that visitors can execute JavaScript and accept cookies: features that all modern web browsers support. This verification happens automatically and most website visitors will never notice it. You may occa…

So to be clear: this is a hosting restriction which appears to be fundamentally incompatible with Printful’s integration. It’s not a problem with your website software, so switching from WooCommerce to Prestashop, or downgrading to an older PrestaShop version will not fix it.