Can't install cypress

I’m trying to install cypress, there is as proxy involved. I’ve read everything on the Cypress web site about proxies and tried everything I know to try. Still can’t install it. I’m doing this from a PowerShell window.

Here’s the setup: I have a .npmrc file with registry=https://{address of our internal npm repository}

I have verified that Cypress is there.

In the PowerShell window, before installing I do:

$env:HTTP_PROXY = "{our internal proxy}"
npm config set registry https://{same address above, to internal npm repository}

After “npm install cypress” I get this error:

===================================================

> cypress@6.6.0 postinstall C:\Code\CypressTest\node_modules\cypress
> node index.js --exec install

Installing Cypress (version: 6.6.0)

  ×  Downloading Cypress
    → Cypress Version: 6.6.0
     Unzipping Cypress
     Finishing Installation
The Cypress App could not be downloaded.

Does your workplace require a proxy to be used to access the Internet? If so, you must configure the HTTP_PROXY environment variable before downloading Cypress. Read more: https://on.cypress.io/proxy-configuration

Otherwise, please check network connectivity and try again:

URL: https://download.cypress.io/desktop/6.6.0?platform=win32&arch=x64
Error: tunneling socket could not be established, cause=connect ECONNREFUSED xxx.xxx.xxx.xxx:80

Platform: win32 (10.0.18363)
Cypress Version: 6.6.0

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! cypress@6.6.0 postinstall: `node index.js --exec install`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the cypress@6.6.0 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:

======================================================

Any ideas on what I am missing?