Hi there!
Thanks for your query! You will find our plan about the Joomla 4 from the below link:
https://www.joomshaper.com/blog/joomshaper-s-plans-for-joomla-4
Sorry to say that, the Spectrum template is not Joomla 4 compatible yet!
The stable version of Joomla 4 has just released!
We have made compatible some of our products with unstable versions of Joomla 4.
So, we will try the stable one with all the issues you all face and report soon.
Note: Upgrading to Joomla 4 right now in production sites is not recommended. There are many third-party extensions like ours that are not fully compatible yet. It is better to wait at least a couple of weeks to see how things are going (It is applicable for each and every new release). Meanwhile, we will update our products accordingly.
Best Regards