@Lordbob123 probably not, if your gpu supports dx12 it also supports dx11, 10 and 9 (altough you may have to install older dx runtimes). The launcher not opening is covered here: https://forum.plutonium.pw/topic/6832/common-launcher-issues-solutions
@Leneking x86 is for 32bit versions of systems. For 64bit versions, download x64 one.
@Lordbob123 either missing DLL's or you forgot to install DirectX12.
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