WP Download Code: Download stops midway even after changes made in download.php

Hello @misanthrop

Please let me know how to solve the problem I am facing. I have installed the plugin as directed. Now whenever I try to download zip files (one has a size of 350mb and another 1.5gb) it stops midway showing the server connection is lost. I tried adding ob_end_clean replacing ob_clean. However, that did not solve the problem.

I run a record label and this plugin seems to be doing exactly what we require. Kindly give us a solution to this problem.