The plecs blockset's license can not be found in MATLAB

My PLECS Standalone and PLECS Blockset is of 4.2.3 and the MATLAB version is 2018b.

My operation system is win7 64bit.

When I try to add component in PLECS circuit from MATLAB/Simulink it says" No valid license found, All editing operations are disabled"

I already got the license from our university. But it still won’t work in Simulink (Operation in PLECS Standalone is OK).

Assuming that you have a PLECS Combo license for both PLECS Standalone and PLECS Blockset, the only known explanation for this error is the attempt to use PLECS Blockset in conjunction with a cracked version of MATLAB/Simulink.

The solution in this case is to install a legitimate version of MATLAB/Simulink or use your legitimate PLECS license with PLECS Standalone.