@makarowicz
Adrien,
Virtually everything on your site needs to be updated.
In order for me to be able to activate your license, You’ll need to update the following:
WC Vendors (free) to version 1.9.11
WC Vendors Pro to v1.4.3
WooCommerce to v3.0.6+
One Social theme to v1.2.1
BuddyBoss Marketplace to v1.4.1
If you want me to update these I *can* .. I was not comfortable making those changes to your site without your permission, as these are big updates. I recommend you backup your site first before updating all of these.