It's a standalone installation. If I let it update itself I think it makes a proper installation of itself, or otherwise does something weird. I remember watching it do that and I don't remember what happened but I remember I had to jump through hoops to undo it, then I tweaked settings to prevent it from happening again.
(On the other hand it has no add-ons.)
My standalone Chromium installations are better about that I think. I forget what version they are. One of them is newer than the other one.
Regardless, this Chrome, as well as the Firefox, are on my older machine. I'm sorta less concerned about keeping things working right. I can easily enough get to workarounds simply by opening up alternative browsers. And considering I basically have five at my disposal, and stuff usually works with at least one of them...