you need to disable automatic update on your android phone. go to Android store, profile, updates and uncheck automatic updates for phone link. That way when an update for phone link comes out for android it won't get updated unless you allow the update to happen.
Here's a step-by-step video on how to do that:
https://www.youtube.com/watch?v=DJtmWUAhha4
For what it's worth, I haven't suppressed app-updates on my phone. I just suppressed app-updates on my PC and the Phone Link app never updates.
I'm skeptical that suppressing app-updates on your phone has anything to do with automatic updates on your PC. Just saying. . .