Crash when installing the plugin

Check php error logs.
Maybe you have short open tags off in php settings.
Should be on for this plugin as listed on requirements page.

Make sure your host meets these requirements:
https://www.videowhisper.com/?p=Requirements

These plugins use php short open tags as there are many parameters that need to be communicated to flash applications. You need this php setting:
short_open_tag On

If you can’t solve the issue, install it in a public location and submit a ticket from https://www.videowhisper.com/tickets_submit.php to have technical staff take a look at your install.