Unable to install Photoshop CC 2019 while running Mac OS Catalina 10.15.7
I have a late 2013 iMac running on OS Catalina (the highest version it's capable of) and my graphics card doesn't support an important feature on Photoshop (v22.2) which is the pixel grid feature, which I use a lot.
I was advised to download PS CC 2019 using the Pro Design Tool link, which I've tried but cannot install. I'm getting this error message below when I do so. I've gone through the troubleshoot and had no luck, I've also tried a number of forums and had no luck.
Why am I getting this error? Do I need to downgrade to an earlier OS version or something?

