Beginning in late 2016 Golden Software began offering both Grapher and Surfer as single user and concurrent use licenses. All current and upgrade eligible single user licenses can be converted to concurrent user licenses for a fee. Please contact our sales department with your serial number or product key for additional pricing information.
To verify that your license is eligible for this conversion sign in to our My Account portal to view your current and upgrade eligible serial numbers/product keys. If your license is not listed under My Products, it either needs to be registered or it is no longer valid because it has been previously upgraded.