Denoise ML from my test is not on pair with Neat Video quality wise.
Regrain does not work as I`d like in Fusion 18.5 beta, plug-in does not show anything if provide it with more than one input. I could be wrong here - never use Silhouette before). When doing denoise/regrain inside Silhouette results are good at first glance.
Could be a red herring but in the plug-in believe you need to select what is being output from Silhouette… default is the roto node from a default setup, but it might be that you need to select the output node instead?
I don’t use Silhouette—just remember that from some training video.
You have to change Render to “Output: Composite” and it works. Both of the new grain tools worked well on the one clip I tested. Denoiser ML was much slower than Neat though.