Budget: 1000 EUR Deadline: 5 days
Good evening
I would recommend not upgrading PrestaShop 1.6.1.23 to PrestaShop 9, at most to PrestaShop 8.2.
PrestaShop 9 is still raw and will have many bugs.
It is also important to understand what custom modules were created and installed, and whether there were changes to the core system. All of this greatly affects the price.
We can discuss all the details in private messages.