As far as I know, there is no API to interact with dashboards’ datasets. You need to interact with survey responses or IDPs.

Long shot, but maybe you could do with a scheduled recurring email dashboard exportation. However, not all formats are supported in the email exportation.

@SalvatoreFerrigno 
1. There’s no dashboard export API, there’s only response export API https://api.qualtrics.com/u9e5lh4172v0v-survey-response-export-guide
So if your dashboard only come from 1 source you can use that API instead, there’s filter and everything within it.

2.. Schedule the email as @vgayraud can be another choice, but the formats are limited

3.. If you need to download thing exactly like how it is in the UI, you can try some automate browser like Selenium 

Hope this help