This version fixed a medium level security issue which happens with PayPal payment plugin. In older version, PayPal payment plugin has a bug which allow dis-honest users with certain level technical skill can pay for the subscription using different currency with the currency you set for your system, thus paying lower price for the subscription.
As you know, this is security release version, so we encourage you to download latest OS Services Booking version to increase security level of your OS Services Booking system.
Regards,
Developer team
