Rhett,
Yes, it is the same as R24 instructions but there may be some things you have missed.
First, make sure you downloaded the most recent plugs Aoktar published at the top of the releases thread. He made new ones just a few days ago.
You should see a new R25.xdl64 file along with the others like the pic. Then just put it in the R25 plugins folder and remove all but the c4dOctane-R25.xdl64 file.
Maybe you just don't have the newest plugs, and make sure you have the matching Octane standalone installed.
Hope this helps.