On april 19 2013 @DavidRutten was mentioning
We’re still working on making it possible to install a GHA without an RHP using *.rhi, hopefully more news on that soon.
If you can get away with not using some heavy-weight installer package like Wise or MSI, we recommend switching to RHI.
I’ve been trying to package a grasshopper only plugin VoxelTools-1.0.14.rhi, this did not seem to work with the error message:
I could not find any follow up from McNeel, other than David’s message, so possibly this error means that grasshopper only is not yet possible.
Has there been any follow up, or is the development *.(mac)rhi system abandoned in favor of yak?