We haven't been able to download a jpg of the designs for a long time
It could be that you opted to download all your designs at once instead of downloading each design one at a time.
Never had this problem. I would download again. After checking my Emblib designs, I don't get pdf, thread list or jpg. After I extract I get the designs and open in my software. Maybe I am doing it wrong.
You can always go back to the separate designs and d/l the color charts as separate PDF files.