FLEXlm 10.8.6.2 doesn't support Mathcad Prime 6.0 or newer

Article1 min readUpdated Feb 22, 2025View source ↗

If you get the error "(-12) Invalid returned data from license server system":. you are probably trying to use Mathcad Prime 6.0 with the old FLEXlm that you can install from the Mathcad 15.0 installation media:. To get floating licenses for Prime 6.0 to work you need to upgrade to a newer Flex. Please refer to the article Installing Flexnet.

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