I got it working on a Galaxy S4 running 4.2.2 (also tried on Nexus 5 running 5.0, and OnePlus One running 4.4.4; but no luck on N5 or OPO).
It's a total kludge, and doesn't even involve the official Drive Link in the Play Store.
On your Galaxy S4 (maybe other Samsung and HTC phones too), you need to side load the Drive Link APK from this site (www colmoschinxtreme com / android / item / drivelink).
NOTE: Make sure you delete any previous install of Drive Link prior to running the above step.
Then run the app on your S4, plug it into your USB in-dash (I'm using a 2015 Subaru Outback with the upgraded 7" infotainment system).
After about a minute (or two), the MirrorLink icon on your dash will go from gray to white.
Tap on MirrorLink, and you will have a projected image of the Drive Link app from the S4, on your in-dash screen. You can use the tools in that app, to bookmark apps you want to use, or you can tap the physical home button on the S4 to get to the Android desktop and then your desktop will be fully accessible via your in-dash touch screen.
It's a very poor implementation, and I hope the folks from Clarion (in-dash infotainment manufacturer) and Subaru (the company who chose what options to implement on the infotainment system) work a lot harder over the next few months to turn this from a tech geeks hack, into a consumer friendly solution that plays nice on other devices.