Gianluca,
Just one point, if you have multiple plans, don't forget to put your free plan parameters into the Subscription Control Settings for each plan. it is not a global setting.
Thanks David for the clarification. After activating the plugin I have seen the "Subscription Control Settings" tab activate in each subscription plan. I have 5 active paid plans every year. Now I have set the plugin options for each plan. This new plugin arrived just in time as in a few weeks I would have to switch subscribers from paid to free subscriptions using mysql.
