Hello there,
I hope you are doing well.
Do you have an already developed site? If yes, please do not update to Joomla 4 as our templates are not fully compatible with Joomla 4, so there's a higher possibility that it might effect your site.
However, if you are up for creating a fresh site, you can go for Helix Ultimate 2.0.0 from here. You can then download the template from the given link. It is Joomla 4 compatible.
Secondly, if you want to update to Joomla 4 from the older version, please follow the documentation strictly.
Latest Helix Ultimate 2.0.0 won't synchronised with the templates now as they are not totally compatible yet, I hope you can understand that.
We recommend you to wait a few more days for the compatibility of the templates. You can then update to Joomla 4 and use the templates without any error.
Thanks!