Hi Adriano,
One problem for users of the previous version under 3.x who have upgraded to IPS4: Warn Log attempts to create a new column in core_members, but due to the existence of the previous version the column already exists. Installation then loops until manually halted.
You'll need to adjust it a little so that on installation the plugin checks for existence of the column rather than assuming it doesn't exist.
Otherwise, just as excellent as the previous version