Why are you using an old copy of WordPress? Were you aware that your site is currently running a very real risk of being hacked? You need to upgrade WordPress asap.
The plugin has been using the wp_get_themes() or wp_get_theme() functions as far back, Version-wise, as I’ve looked. Both those functions require WordPress Version 3.4 or newer.
The plugin had serious problems before Version 4, and I know that not even plugin Version 3.3.1 works prior to WordPress Version 3.4.
Even the first version of the plugin was released well after WordPress Version 3.3.2 came out, so it would never have been tested.
In summary, I cannot recommend using any version of this plugin with WordPress Version 3.3.2. Sorry, but like esmi, I can only advise upgrading WordPress. I am, in fact, so concerned about being hacked on old versions of WordPress, that I only run my test systems on old Versions of WordPress on localhost, i.e. – my own workstation behind software and hardware firewalls, without any way for the Internet to access it.
