Hi there!
Sorry for your issue.
Would you please let me know which version of PHP you are using now? PHP 8.0.22 or PHP 8.1?
The Helix Ultimate framework is compatible with PHP 8.0 maximum.
Yes, the Manufacturer template doesn't compatible with Joomla 4 yet, but it will get soon. As the template integrates with j2store and j2store hasn't received the Joomla 4 compatibility update, so we are bound to wait for it. Once it is available we will move forward with all our eCommerce based templates.
Best Regards