When downloading Matlab r2020a I get an error and it doesn't want to continue. The installer has created a zip, unpacked but upon set up I get an error message 'Error communicating with the backend services'. System requirements are good. Windows 7, service pack 1, Intel 64 bit operating, 4.0 G RAM and sufficient discspace avaiable ~50 GB. I'm having this error for the last two days. How can I avoid this error and download the Mathlab Simulink R2020A product?