I'm very familiar with the install process - done it dozens of times. This is the first time I've seen this problem.
I FTP uploaded Gravity Forums 1.6.11 to WordPress 3.5 site.
I navigated to Plugins and clicked Activate once upload was complete.
I received the following message:
Plugin could not be activated because it triggered a fatal error.
Warning: require_once(/home7/shurethi/public_html/shurefoods/wp-content/plugins/gravityforms/widget.php) [function.require-once]: failed to open stream: No such file or directory in /home7/shurethi/public_html/shurefoods/wp-content/plugins/gravityforms/gravityforms.php on line 72
Fatal error: require_once() [function.require]: Failed opening required '/home7/shurethi/public_html/shurefoods/wp-content/plugins/gravityforms/widget.php' (include_path='.:/usr/lib64/php:/usr/lib/php:/usr/share/pear') in /home7/shurethi/public_html/shurefoods/wp-content/plugins/gravityforms/gravityforms.php on line 72