Hello ...
I wrote this message three weeks ago:

I have a Student Licence of MathCAD 15.0 at Windows 7. The System where I have installed Mathcad has crashed. How can I reinstal MatCAD? Further, I want Install Mathcad 15.0 update at Windows 10.
I'm thankful for any help.
Regards Jurgen

I have got a response from this community:
You can submit a support request in "Academic Case Logger", here: http://support.ptc.com/appserver/support/academic_case_logger/academic_case_logger.jsp

Than, I have called up the link, filled out the form and received an answer:
Hello,

As a University and estore Mathcad support, you have access to our commercial tech support team. For support inquiries, please file a support ticket. You will need your Sales Order Number (SON) or customer number to submit a ticket. Instructions can be found here.

If you don’t know your SON or Customer Number, please contact academicsuccess@ptc.com

Regards,
Abdul

Than, I have requested a SON and I have get the followed response:
Could you tell me if you purchased Mathcad via our eStore?

Regards,
Oana

I have sent my Licence Documents at an Attachment and now I have get no response.

What can I do to get further help?
Why is the reinstall procedure so very difficult?
Is there any way to reinstall MathCAD and how long will it take?

regards Jurgen1