'Download Logs' should download all logs within the specified time range
Currently it only downloads logs that are loaded in the display pane. In order to get it to download everything, I have to scroll down until everything is loaded.
This behavior was a bug that was fixed in the latest release, PI Integrator for Business Analytics 2018 R2. Please upgrade to the latest version if you are still experiencing this issue.
I see that this has been fixed in the December 2018 release.