PKG files can't install (fatal error)

So, my CPU is the issue. Would an FX 6350 be enough to run rpcs3?

As far as I know, my GPU does support DX 12 (basic features).

FX-6350 has SSE 4.1/4.2 support.
I run RPSC3 with a FX-8350 with overclock.

Then the AMD website must be outdated regarding the DirectX support of those graphics

DirectX 12 support and feature levels are confusing.
For the record, we use DirectX 12 Feature Level 11.1.