I'm not employed by Logitech, so I'm not here to handle your customer service complaints. In any case, Logitech has already released a fix, so I suggest that you contact them if you're still experiencing the problem.

The certificates for signing the macOS app expired. Because of that the patch needs to be manually installed instead of auto updating itself.

Things go wrong sometimes. This is mostly people catastrophising things on the internet for points.

They rewrite the functions on the fly. I.e. if Mouse4 is "navigation back" by default and you "set" it in the software to "Keyboard button A" then the software running on your computer (not the mouse) rewrites "navigation back" to "keyboard button A" on the go.

It's so bad what if you CPU is hogged then sometimes you would occasionally get the "real" button function (ie navigation back) instead of the "reprogrammed" one. Or sometimes - both.

It's utter bullshit of the design and the reason I threw that shit in the wall on day 2 and went to the store to buy Razer DeathAdder V2 HyperSpeed (R)(TM). Despite the ridiculous name and quite shitty application - most of the functions are actually stored on the mouse (besides some macro things, which is a pity, but again...).

Oh, by the way, the software I installed on my notebook to "program" that Logishit kept working, downloading updates, updating and not deleting the previous versions. I suddenly got "low disk space warning" and was like... what? And then I found this Logishit spent 20GBs of space for it. For doing nothing. Literally nothing.

But what is really puzzling is why @dghlsakjg is defending Logitech here. Maybe he has their stock or have some form of so called Stockholm syndrome.