From: DeskNow Knowledge Base
http://www.desknow.com/kb/

The upload size (100000 kb) exceeds the limit of 51200 kb
http://www.desknow.com/kb/idx/6/009/article/

This error happens when trying to upload a file using the DeksNow web interface.

DeskNow by default rejects uploads of files bigger than 50 Mbytes. You can change this parameter by logging in as admin, and then visiting the page Administration/Security/File