Deny from all
is the .htaccess command (the actual contents of this file that you are trying to view). Not denying the ability to edit the file. Just re-run the .htaccess file in the selected text editor and make the necessary changes, save it, and then reload it into the desired folder.
Although I think that inadvertently you block even yourself from viewing the mentioned application after downloading it.
I would do something like:
order deny,allow deny from all allow from 127.0.0.1
which will reject all but the IP address in the allow from line, which you will change the IP address to match your IP address, which you can get from http://www.whatismyip.com/ or a similar site.
chris Feb 29 2018-12-28T00: 00Z
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