Quicken 2010 no longer allows QFX import (all Quicken versions do that after three years). I would suggest to switch to CSV2QIF QIF import never expires.
CSV2QFX creates QFX and CSV2QIF creates QIF files, both importable into Quicken. Both converters help you create a file importable by Quicken.
Quicken 2010 no longer imports QFX, but still imports QIF (and always will be).
Here is the article for QFX vs QIF differences: