handle file downloads from the server

I am wondering if the following would be a good technique to allow user to download files from the server in the below scenario:

Info about the scenario:

User logs into a system (HTML,JQuery and CSS, Javascript based), There is a Download button in the UI. Clicking on it triggers a backend Java Message based (JMS)process which uploads a file on the server. This process could take few minutes to an hour depending upon how long the back end process takes to generate CSV files and upload it onto a server.

Note:JMS can handle asynchronous requests from the U so I am not worried about browser freezing after first Download click.

Approach I am thinking:

1) Right now I am not sure how I am going to notify user once files are downloaded but let’s say user clicks on the button and returns back after 30 minutes and let’s say files are ready.

2) I am planning to show a new button(which could say Download files from here) after user logs back in after 30 minutes. Maybe I would hide the original Download button in this scenario. This new button will only appear if files are present on the server. Otherwise, I would keep showing the original Download button and maybe I could change the text of original Download button to Come back later as soon as user clicks on it.

Does the above approach sounds good or is there something better I could do. Any better ideas if anyone can share, that would be great.

Please let me know if I can answer any questions.Thanks

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