Troubles with YOURLS install in subdirectory WP 4.0

Hi all,

I’m trying to install YOURLS in a subdirectory of my website. I’ve tried through Softaqulous following these steps: http://kb.site5.com/control/cpanel/cp-software/cpanel-how-to-install-yourls/

as well as manually setting up everything using these instructions: http://yourls.org/#Install.

When I then go to the link http://www.mywebsite.com/admin I should see the final YOURS install page, but unfortunately I get the error “page not found”.

Does anyone have any ideas what the problem may be and how to resolve this?

Note: I am not using any yours plugins