Be warned! This plugin author decided that the API update was a great time to start charging for something you already use. In addition, your Admin for using the Free plugin will be filled with Ads and "Go PRO" links.
Now, I will be the first to wish that plugin developers earn a decent living, but I feel that it is appropriate to develop new features for your paid version of the plugin. Instead, the author has lowered the bar: pay for the same functionality that you already have, or get something worse for free.
My vote--is to find another solution where the plugin author is a consistent. Offer a plugin for free with paid version, or offer it for free--but, to demand money for something that used to be free feels like extortion.
UPDATE: You don't need the FREE version of the plugin at all. According to user: @froginthevalley Sylvain Carle (from Twitter)
If you are hosting your own wordpress.org blog, the easiest way is to add a text widget to your sidebar (in Appereance » Widgets) and paste the widget code you get from https://twitter.com/settings/widgets/
You can find the entire discussion here: https://dev.twitter.com/discussions/10633