The issue described in the below linked thread, which is now closed as supposedly the issue was resolved in an update, is happening to me with the newest version of Quicken 2020 (26.23):
https://community.quicken.com/discussion/7872672/bug-with-25-19-release Every time I download an QFX, Quicken begins importing the transactions and matching them to the register but then, once it has, it crashes back to the desktop. Upon re-opening Quicken, the downloaded transactions are there and can be accepted without issue. I don't crash again until I download the transactions for my next account.