Note: to follow the instructions in this article, you will need to have both access to the machine that the license is currently plugged into and have the Zemax License Manager installed. If you possess a softkey license, start with ' How to troubleshoot softkey license issues.' If you possess a black USB license, see ' Troubleshooting license issues with Black USB key licenses ' See Ansys Zemax licensing overview and guides If you have received an Ansys Entitlement email, this article does not apply to you. This also applies only to single-user licenses where the USB is plugged into the machine running Opticstudio. If you received an activation code from Zemax instead of a physical USB dongle, you do not own a USB license.

You can identify your license type using the guide located here: How to identify your legacy Zemax license. This article applies only to software licensed via legacy Zemax Red and Green USB license dongles. This applies only to single-user licenses where the USB is plugged into the machine running Opticstudio. This includes the license key not lighting up, showing an invalid support date, or if Opticstudio or the Zemax License Manager is unable to use or see the license. This article describes ways to resolve various issues that may arise with your Red or Green USB Zemax license keys. They contain all the license information needed to launch the software.

Red and Green USB licenses were sold as an option to Zemax Opticstudio customers. This includes the license not lighting up and error messages that prevent starting the software.

This will help identify ands resolve common issues using a red or green USB license on your machine.

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