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Most of the time, the license is there, but the software simply isn't looking in the right place.
: Sometimes system paths are missing. Ensure your system path includes the Labcenter directory if you are using network-based licensing. community.intersystems.com Network and Cloud Licensing Resolved: "Cannot Find a Valid License Key for
If you are working on a PCB design or circuit simulation and see the error you aren't alone. This is a common hurdle for users of Proteus Design Suite (the software package that includes ISIS). community
Uninstalling old versions of Proteus (v7, v8) often leaves orphaned registry keys that confuse the v8 or v9 License Manager. Are you using a student/trial license but trying
Are you using a student/trial license but trying to run "ISIS Professional"?