Hello,
Thank you for reaching out!
We have drivers available for downloads all the way down to OS v10.6. You have to expand Legacy section at the bottom of the page to see them:
https://www.displaylink.com/downloads/macos
The highest version available for Yosemite 10.10 is driver v2.5 available here:
https://www.displaylink.com/downloads/file?id=117
Best regards,
Katarzyna