Hi Rick,
I have been banging my head at this problem today and I was finally able to install AFNI. I became a bit desperate and thought maybe the permissions on the tgz file were incorrect so I changed the permissions on the file (good old chmod 777) and afni was installed. I'm not sure why the permissions on the tgz package had to be changed, it may be some sort security setting my colleague has set up on her computer. I honestly don't know enough about these things and should learn more! Thank you for your help and quick responses
Naail