What this translates to is that Photoshop now requires a CPU with SSE4.2 support. If your CPU doesn't have that support, you get this message.
If you're trying to install Photoshop version 22, it won't work. I can't recall exactly when this requirement took effect, but if you have a previous Photoshop version that works, keep using that. Or upgrade your system with a more current CPU.
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