@saimraza786 why just not to run node js server not in BAS? set 2 endpoint url's, one to push data on server , and second to retrieve data from server to BAS only by GET request?
Instead of clicking on download button you have to take download link.
You can do that with "get element atribute", and as atribute use href.
Than use that link in "Download" action. There you have to define
full download file path along with downloaded file name and extension.
So you can define your desirable folder.