The semtree program is a package for the R programming language. Please install R first:
Get R: http://www.r-project.org/
To download and install the semtree package from CRAN (https://cran.r-project.org/package=semtree), type the following command in your R prompt:
This will install the latest, stable version. Please note: The package is still considered beta status.
The source code and the latest developer version can be found on github:
Note that OpenMx provides different versions on CRAN and on their website. To install the non-CRAN compatible website using the NPSOL optimizer, install OpenMx from their website:
Get OpenMx: http://openmx.psyc.virginia.edu/