I updated from 4.18.8 to 5.1.2 , not pro just the basic. After a download starts i leave it then when i come back to my Mac there's no connection anymore, whenever i try to quit it refuses, force quitting does nothing so i have to restart my computer every time. I repair disk permissions but doesn't fix the issue. I have trashed this newer version in favor of an older one that actually works.

Intel iMac
OS 10.5.6