Hi Tom,
Welcome to the discussions. Four ways to get your data to open in Quicken come quickly to mind.
1. Launch Quicken, then drag your downloaded file to the Quicken icon in the Dock.
2. Launch Quicken, then File > Open > navigate to your downloaded file.
3. Right-Click or CTRL-Click your downloaded file and choose Open With..., and pick Quicken from the list.
4. (Saved the best for last) Right-Click or CTRL-Click your downloaded file and choose Get Info, under Open With choose Quicken, then Click the Change All button.
Method 4 has changed the default application for the downloaded file type to Quicken. Be aware that if you ever want to open the file with Numbers or TextEdit, etc. you'll now need to use one of the other methods.
Regards,
Jerry