So the fundamental issue is that you have a powershell that can’t talk with the internet at large because it doesn’t support TLS v1.2. To fix this, you should read the Windows platform instructions and install the TLS easy fix, then update your powershell: Platform Specific Instructions for Official Binaries
If you can’t do that, you can try installing curl, then setting the environment variable BINARYPROVIDER_DOWNLOAD_ENGINE to the value curl. Do that, then run the commands I gave you above again.