HomePort Update

I use HomePort extensively for creating routes. I have the Active Captain markers and find them very useful.

It is my understanding that Garmin has removed support for Active Captain markers from HomePort and that any update to HomePort will delete these markers. I don't want this to happen, I would rather have the older version.

HomePort (on my PC) keeps trying to install an update each time I load it. I can cancel the update but I'm afraid if I miss the chance, the program will be updated and the Active Captain markers deleted. So:

Is there a way that I can stop HomePort from trying to update itself each time I start it?