WebR package install

Package Use Questions
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1

Thank you for making WASM binaries available for download.
I tried to to use the repo but got an error. Here is the code:

var webR;
import('https://webr.r-wasm.org/latest/webr.mjs').then(async ({ WebR }) => {
  webR = new WebR();
  await webR.init();
  // ok, but gets older version from repo.r-wasm.org :
  // await webR.installPackages(["echarty"])  

  // trying to get the latest version
  await webR.installPackages(["echarty"], {repos:'https://helgasoft.r-universe.dev'});  
ERROR 404:
https://helgasoft.r-universe.dev/bin/emscripten/contrib/4.4/PACKAGES.rds
Unsupported PACKAGES format: rds

Am I doing it wrong or is it some kind of bug ?