The underlying C api for Metis changed considerably in the new version 5.0 that was released within the last year. I had previously updated the metismex interface to work with an alpha release of metis 5.0 and posted it on github. However, the final release had a ton of new changes to the API.
So if you need to use metis to partition graphs, methods, or to compute nested dissection orders with it, go checkout my github repo for metis mex. It’s still a little rough on how to use it, but I hope those who are motived can figure it out with the help of the readme.