Once installed it is indeed an easyway to safely store and manage my passwords across different browser I use.

For those experiencing problems to get it to work:
- delete the folder C:\Users\#####\AppData\Local\nordpass-updater
- install the browser extension using the configurion settings in the Nordpass Password Mgr app. Do not use a downloaded installer.
- Activate the browser, accept the key pairing and it should work.

Hope this helps those who had problems and rated the app just a 1-star. A pity Nordpass Support does not supply this advice themselves.