404 on "[Plugin: Widgets In Tabs] Plugin could not be activated"

Plugin could not be activated because it triggered a fatal error.

Parse error: syntax error, unexpected '[' in /cpanel-home/qualitys/public_html/wp-content/plugins/widgets-in-tabs/widgets-in-tabs.php on line 573

WordPress 4.5.3 running

https://wordpress.org/plugins/widgets-in-tabs/

You need to either Upgrade PHP to 5.4.0 or edit that line to use a variable instead of directly dereferencing the array retued by the function.