Use command create-react-app as usual. Then after you've got errors due React 19, delete folder node_modules and files package.json and package-lock.json.

After that, add files package.json and package-lock.json from archive below - these files are backup versions from when last stable was React 18.3.1

After that, run command npm install

You'll get working React 18.3.1 App as before)

_package.json package-lock.json backup cra React18 - OK