Problems using MOSEK

I recently re-installed CVX and MOSEK. Installed the latest version of CVX and MOSEK 9.1 and have an academic licence. The Matlab version is R2014a, and runs in Windows 64. The cvx_setup works fine but it does not locate mex files. Above the message resulting from cvx_setup:


CVX: Software for Disciplined Convex Programming ©2014 CVX Research
Version 2.2, Build 1148 (62bfcca) Tue Jan 28 00:51:35 2020

Installation info:
Path: D:\MyDocuments\cvx_2020\CVX\cvx
MATLAB version: 8.3 (R2014a)
OS: Windows 8 amd64 version 6.2
Java version: 1.7.0_11
Verfying CVX directory contents:
WARNING: The following files/directories are missing:
D:\MyDocuments\cvx_2020\CVX\cvx\sedumi.travis.yml
These omissions may prevent CVX from operating properly.
Preferences:
Path: C:\Users*******\AppData\Roaming\MathWorks\MATLAB\cvx_prefs.mat
License host:
Username: *********
Host ID: 00ff0c646eaa (eth2)
Installed license:
Organization: Instituto Superior de Engenharia de Coimbra
Contact: **********************************
License type: academic
Named user: ********
Host ID: e0cb4e70db12
Expiration: 2021-09-25 (365 days remaining)
Status: verified

Setting CVX paths…already set!
Searching for solvers…5 shims found.
2 solvers initialized (* = default):

  • SDPT3 4.0 {cvx}\sdpt3
    SeDuMi 1.3.4 {cvx}\sedumi
    5 solvers skipped:
    GLPK
    Could not find a GLPK installation.
    Gurobi unknown {cvx}\gurobi\w64
    No valid Gurobi license was found.
    Mosek unknown {cvx}\mosek\w64
    Unexpected MEX file failure:
    Invalid MEX-file
    ‘D:\MyDocuments\cvx_2020\CVX\cvx\mosek\w64\mosekopt.mexw64’:
    Cannot find the file.
    Mosek_2 unknown G:\Mosek\9.1\toolbox\R2015a
    Unexpected MEX file failure:
    Invalid MEX-file ‘G:\Mosek\9.1\toolbox\R2015a\mosekopt.mexw64’:
    Cannot find the file.
    Mosek_3 unknown G:\Mosek\9.1\toolbox\R2015a
    Unexpected MEX file failure:
    Invalid MEX-file ‘G:\Mosek\9.1\toolbox\R2015a\mosekopt.mexw64’:
    Cannot find the file.

In case someone has suggestions of what is wrong and how to fix I will be grateful.
Cheers

Your version of MATLAB is too old for Mosek 9.x.

https://docs.mosek.com/9.2/toolbox/install-interface.html

The Optimization Toolbox for MATLAB can be used with MATLAB version R2015a or newer on all 64-bit platforms.

I suspect running mosekdiag at rhe MATLAB command line would reveal the failure.