vendor daemon is not being read...File not found, __PTCD_PATH__

Hello I can not use MathCad because I have a problem with the vendor daemon it is not being read, this is what is happening...

License file(s): C:\MathCad Licence\lm_41980836.txt

(lmgrd) lmgrd tcp-port 7788

(lmgrd) Starting vendor daemons ...

(lmgrd) License server manager (lmgrd) startup failed:

(lmgrd) File not found, __PTCD_PATH__

(lmgrd) License server manager (lmgrd) startup failed:

(lmgrd) File not found, ptc_d.exe

So where I can find _PTCD_PATH_ and ptc_d.exe,I think the route is not good

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Vendor daemon status (on ISSAC):

ptc_d: The desired vendor daemon is down.

Check the lmgrd log file, or try lmreread.

Vendor:Host: ISSAC

License path: 7788@ISSAC;

FLEXnet Licensing error:-97,121

For further information, refer to the FLEXnet Licensing documentation,

available at "www.macrovision.com".

Please is very important to install MathCad