Ok. I just called them and someone is supposed to be calling me back..... :).
Looks like a problem with mod_sec settings on your server.
If you already get an 500 error when accessing http://www.thecamfoundation.org/NSF/learningcenter and don't see the first installation page it is most likely a permission issue with the folders. On some servers a setting of 777 for folders will not work. You can try 755 instead for the "NSF", the "learningcenter" and the data folder respectively.
Another hint:
RewriteBase /public_html/NSF/learningcenter
is not correct. You need to set
RewriteBase /NSF/learningcenter/
in .htaccess instead.
It's also better to create the data folder not within the public_html folder. You should creat it on the same level as the public_html folder instead, i.e. in the home directory of your webhosting account.
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