You can download it at www.garmin.com/support/download_details.jsp?id=6591.
This release should fix the export issues on Windows 8.1.
It should also fix some start-up crashes that were caused by incorrect track calculations.
One thing that is not yet fixed is the start-up issue on computers with on-board Intel graphics chipsets (Intel GMA 3x00). We can reproduce that issue but won't be able to get a fix for this out till January.
Please report back if you still cannot export or if you get any kinds of crashes.