Links to GHI Documentation does not work in the support !!!
GHI Premium NETMF v4.2 Library Documentation
GHI OSHW NETMF v4.2 Library Documentation
GHI Premium 4.2 does not work for me since yesterday afternoon
To get you out of trouble add OLD to the URL after downloads but before NETMF, so
http://www.ghielectronics.com/downloads/old/NETMF/Library%20Documentation%20v4.2/Premium/Index.html and http://www.ghielectronics.com/downloads/old/NETMF/Library%20Documentation%20v4.2/OSHW/Index.html should work.
WOW 4.2 is already considered as old !!!
@ leforban - no that was a mistake. We are cleaning up all our resources.
My mistake 
… I’ve restored the downloads subdirectory so links will work