Hi @ivar_svendsen,
Thank you for posting in Intel community forum, hope all is well and apologies for the delayed in response and in software center experiences.
Yes you can download HLS compiler pro with more latest version to work with the Quartus lite, the following get started guide would help to better explain the entire processes step by step.
- https://www.intel.com/content/www/us/en/docs/programmable/683680/21-4/search.html?q=quartus
To download the HLS compiler, in the software center choose the desire quartus version (e.g., Quartus Pro Window 22.2), in the 'Additional Software' tab, you would be able to find the 'Intel® High Level Synthesis Compiler'.
Hope that clarify your doubts.
Best Wishes
BB