It could be that randomly the virus scanner thinks it's dangerous. There's no consistency on how that happens, some builds it doesn't trigger and other builds it does. You can try seeing if turning that off while downloading allows it to install. Or the increased size/scale/systems of this demo just might not be able to function on your device. If that's the case, I'm sorry you can't play it.
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The antivirus on my phone only gives me a warning after installing something so it's definitely not that, and the scale/size stuff sounds a little dumb because more demanding games like trials of mana, call of duty and genshin run fine on my device, i have 3gb of ram so I think that's good enough, and i have android 10 but if that was the problem my phone wouldn't even recognize the app, so i guess i have no solution to my problem, at least I'm happy to know that I'm not the only one with this issue