We have some fixes coming this week: https://forums.galciv3.com/462989/page/1/#3534099
If those fixes don't help resolve your crash issue please feel free to report your issue to Support. The download you are seeing is the steam client updating the cloud.
Link to forums for explanation:
Link to support tool:
Here is the location for dmp files:
"C:\ProgramData\Stardock\Galactic Civilizations III"