I recently installed TeXLive 2016 on a partition where I run Windows 7 Ultimate SP1 OS (Italy-localized). I am experiencing some problems with the installation of the additional fonts. Following the instructions I found in many sites, I downloaded and also successfully ran the appropriate script
install-getnonfreefonts. Then I tried to execute
getnonfreefonts-sys -a to get and install all the fonts but I received an error message telling that the SSL certificate issued by tug.org is not valid. This error prevented
wget.exe to run and do the right job. A Google search shows that some time in the past a specific question about this problem had been posted here but the related thread is currently unavailable because that question (together with all its answers) has been removed. As it stands, I cannot tell whether it is an OS issue (I did not find anything useful on the web) or there may be something wrong with TeXLive. I succeeded in catching an image from my Windows console I got by trying to obtain a list of additional fonts:
As it can be easily noticed, error message comes with the exact IP address (and port number) of tug.org.