Pspice for TI not possible to install

Tool/software:

I tried to install Pspice for TI, but it does not proceed : PROXY AUTHENTICATION shows "unable to communicate with proxy server using entered credentials"

Also, all below links are not accessible from my PC.

https://cdsplicwc.cadence.com/

https://software-dl.ti.com/

https://downloads.ti.com/

Would you please advice me how to proceed to install, avoiding above issues?