I realized I had this same issue 1 month ago. Support instructed to do below and after I restarted my computer it was all good.
"please try closing things down including PokerTracker4, then restart it. This time you may see that download dialog again but I would expect the error to not occur and things will run like they used to. If for some reason it doesn't help, reboot your computer and then open PokerTracker4."
However, today this is not solving the problem *shrug*
