I've windows 10 Pro x64 and from my side I consider obsolete x86 apps is there any way of forcing Moo! only the x64 app for windows instead of using the x86 that is using now??

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Roses don't bloom on the sailor's grave

Unless you are doing CPU computing, there is ZERO advantage to a 64-bit version as your GPU(s) are doing all the work.

There is NO "gpu-based" DNet client that is 64 bit for that reason, all of the 64-bit clients are CPU-specific (and very SLOW even on current CPUs compared to very old GPUs).