Sorry, I should have asked if you were using a downloaded binary or building ParaView yourself. The option I gave is for if you build ParaView manually.
So it looks like you’ll have to download the MPI version of ParaView to get the VTX reader. I dug into the CMake and code for that reader and it appears that it was written in a way that requires MPI, unlike other ADIOS readers (the Image reader and the Fides reader) which are written in a way that MPI isn’t necessary, so that’s why it’s not working for you. Can you download the version with MPI and see if that works for you? You shouldn’t have to run ParaView with multiple processes for it to work, just having ParaView with MPI should be enough to get it to work.