'Fair use' policy is now applied for free usage of MP3 Skype recorder. You can use recorder for free for personal non-commercial use if you are not exceeding 30 hours of recording in last 30 consecutive days. Any records older then 30 days are not counted. The recorder will stop recording until the usage for last 30 days will drop below this threshold. 

You can switch to MP3 Skype recorder Pro Edition if you are heavy user and want to remove this limit or to support project.