Cannot install Topaz Labs as plug ins PS 2021 Mac

I have recently purchased the Topaz Labs software. In particular, I am trying to use Denoise, sharpen and gigapixel. 

I have spent a couple hours today trying to figure out how to get it to work.

I came across a support page for Topaz that says it is not compatible with PS 2021: https://help.topazlabs.com/hc/en-us/articles/115004587027-Adobe-Photoshop-Configuration-guide-Using-Your-Topaz-Labs-Plug-ins

However, I have also come across a thread here where a user claims to have gotten it to work, on Windows though: https://community.adobe.com/t5/photoshop/unable-to-install-topaz-plugin-in-ps-2021/m-p/11587037?page=1#M483654

I have followed these steps, but it did not work on my Mac.

Other threads seem to be dated (apparently version of PS matters) and generally seem to suggest uninstalling, restarting, and reinstalling, which I have been through. 

I had also come across another Topaz support page: https://support.topazlabs.com/hc/en-us/articles/218382688-Accessing-Topaz-Labs-in-Photoshop-CC

However, the Photoshop Utility (method 2) did not support anything past PS 2018. Reinstallation previously didn't work (method 1) and I did not have a Topaz Labs folder in my Application Support (method 3)

I'm at a loss for how to get this to work as a plug in. My understanding is that I should be able to access it from the filter menu and I just can't.