I don't know that this is the place to write about Niagara plugin, but there is no board name containing Niagara, so...
I'm currently working with UE4.26, but the Niagara plugin only support for 4.25.3 right now.
Does SideFX have a plan to support Niagara plugin for 4.26? EngineV2 is supported by daily build, but not the Niagara plugin.

Hi,

We currently don't have 4.26 binaries ready to be downloaded, but you can build the 4.26 plugin yourself using the code on GitHub:

https://github.com/sideeffects/HoudiniNiagara/tree/SharedBuffer-4.26 [github.com]