For installation, please check the documentation at https://gempixel.com/docs/premium-url-shortener#guide

Please note that I am dedicated to provide a premium yet free support for all of my customers. There are several ways you can reach me, here is a list.

You can first consult the list of FAQ here: https://gempixel.com/solutions

If your issue isn’t listed there or the fix/solution doesn’t work for you, you can submit a ticket: http://support.gempixel.com/support/tickets/new

Or if you prefer, you can send me an email either from http://gempixel.com/contact or http://codecanyon.net/user/KBRmedia#from

Yes. However the only issue might arise from URL rewriting. The following code has been tested by me and a couple of buyers and seem to work fine. Please note that this code must be added to nginx.conf and you will need restart your server for the change to apply. The code below should be added within the server { } block.

 if (!-e $request_filename)
    { 
        rewrite ^/admin/(.*)?$ /admin/index.php?a=$1 break;
        rewrite ^/(.*)$ /index.php?a=$1 last;
        break; 
    }