Special instructions to install MLANP v.1.5.0 or other versions on MAC. The problems are given by the  the package Rpanel and bwidget tools, used for some interactive teaching tools; maybe in a future version I will change such interactive tools, because Rpanel often caused problems.

1. Close RStudio or R

2. Find on the web the bwidget tarball file (without installing it). My version is "bwidget-1.9.14.tar"

3. Copy it on /usr/local/lib/ 
(e.g. from a terminal: sudo cp bwidget-1.9.14.tar /usr/local/lib/)

3. Open a terminal and then give the commands:

cd /usr/local/lib/
sudo tar -xvf bwidget-1.9.14.tar

5. Previous step should solve the error 
about Bwidget

6. Download XQuartz, install it and run it.

7. Open RStudio and then install Rpanel. Now it should work