Creo student version liecence request failed erroe code is -21

Same issue: https://community.ptc.com/t5/PTC-Education-Forum/Creo-11-student-Installation/m-p/955314#M14518 

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@MB_11420304 wrote:

i have installed creo student version but the request has been failed and the error code is -21 how can solve this troubleshoot problem

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Hi,

license file mentioned in error message contains Creo Parametric 10.0 license. It cannot be used to run Creo Parametric 11.0.

Please read following documents:

https://apps.ptc.com/schools/references/install_creo11_schools_standard.pdf

https://apps.ptc.com/schools/references/install_creo11_unistudent_standard.pdf