is it possible
programatically click save directly to path using saver without clicking save button
No, there isn't a way to fully automate the Dropbox Saver, but if you want to perform save operations like that programmatically, you can use the /2/files/save_url API endpoint instead.
That's a link to the documentation for the HTTPS endpoints themselves, but we recommend using one of the official SDKs if possible. Those have corresponding native methods for the HTTPS endpoints.
pop up blocking,
The Dropbox Saver unfortunately does not officially support data/blob/object URIs like that, but I'll pass this along as a feature request. I can't promise if or when that might be implemented though.