Instead of having users access a blind URL and run a a blind script, i wonder if a one-liner like this might be easier to follow for people?
Suggested new instruction
source("http://openmx.psyc.virginia.edu/getNewOpenMx.R") # which runs this silently repos
I think the current scheme makes things a bit more obscure and non-standard than need be, unless we made the install script more elaborate, like
Another benefit is that by exposing the install.packages command, people can modify it for their local needs (our students for instance often can't write to the base library path, and have to modify the lib parameter.