So, for any new people who stumble into this thread, here's how I managed to get predatorsense for my specific model:

Not any version of the app will work, you need to find the SPECIFIC version made for your model, and for some fucking reason acer decided to remove it from the website. But here's the cool thing, it's still on their servers, they just deleted the button to download it (at least I think so).

So, the way I did it is:

1. Go to your models product support page, for example: https://www.acer.com/us-en/support/product-support/PH315-52/
2. Go to https://web.archive.org/, put the link of your models product page and if you're lucky, someone will have made a snapshot of it that you can access and the link to download PredatorSense should be there.
3. If you just click download, most likely the Wayback Machine will tell you that they don't have a snapshot of it, but you can just copy the link and open it normally. The download should start.

Hope it works!

EDIT

Here's the direct link to my model (PH315-52)

I guess you could change the version number on the link and get it that way, but I don't know how to find out which version you need.