It just got the love it needed
Latest installer here Merge pull request #2188 from jbf1212/rpw_engine_update_v2 · eirannejad/pyRevit@9af22d9 · GitHub
The back story is:
The latest ipy engine 2711 was incompatible with one of the rpw module import.
We deprecated “prior to 2711 engines” in the latest release. Therefore the error, 3 args required 2 passed.
The way the ironpython wpf dll was brought in in rpw was the issue.
@jbf1212refactored the way to import it mimic-ing the way it is done in pyRevit in general and it seems to behave just fine now