So Telstar, that is a lot of questions. Let's see;
First off, XXHighEnd still runs under the 32bits OS. However, some feautures may not work because too complicated to make twice. IIRC, preventing the system from automatically upgrading is one of them. There could be more. All I do is fire up XXHighEnd on a 32 bits (W7) machine - and don't use it for playback.
But I want to try windows10
If your CPU really supports 32 bits only, then you are in bad luck. W10 only comes in 64bits versions (although I recall that at very first it was (could be) also 32 bits - like the Consumer Preview).
and I do have a license for a Home edition.
I want to use my android tablet as remote/screen/controller for it, MS RPC is the best app available?
Bad luck again, because RDC is not suported on Home. OK, only 3 weeks back I managed to tweak a Home OS to accept it after all.
Anyway, yes, I think we all will agree about MS RD program which is available for Windows itself, OSX, IOS and Android.
and also it requires the PC to be connected to my LAN?
Yes. But Internet can be avoided.
the creator's update like I use on my work PC (build 16299)
See the other topic you posted in, and my response about it.
I can download any iso and hopefully a usb installation will work.
They all do. But if your cpu is 32 bits only, they all won't.
which is this Silverstone usb card I read in some posts? My pc doesnt have a lineas psu yet, but the DAC usb is isolated: should I get one?
Let's say that this is outdated, definitely per W10 14393.0. But, not by 100% guarantee because most who actively used and reported, use the NOS1 DAC. Today I think we all use the USB3 port and this too is dangerous to advise because now again many use the same mobo (like ASRock X79 or X99M uATX).
Notice that you will need (from the top of my head) XXHighEnd 2.01 for W10 suport. And depending on the W10 Build, later versions (but of course using the current 2.09 does the job).
Also, I will be upgrading it with a manycore 64 bit cpu later this year. What are your thoughts about AMD epyc (32 cores)?
Maybe you know that we supply an audio-dedicated PC (Stealth Mach II LPS). It can very well be that this ends up in there, when the current X99M runs EOL. But, chances are I think higher that it won't happen, because that processor is not "cold". But I suppose I will try anyway. Notice that this is all in the context of 40 core Xeons (hyperthreded) which also run in that PC without overheating. And the "standard" 20 core is cheaper - at least the last time I looked.
Summarised, I will try it, but don't give it a big chance.
I do need a mATX or even better ITX motherboard to save space inside the case (which I'm NOT changing).
Unless things will be changed (or already have been), ITX is NOT good. This is for reasons of the power supply and how it is implemented and the parallel memory leans (two instead of four). uATX is fine, as long as a decent MoBo exists, and this historically not has always been the case (but wait a year and it's back again for the latest chipset etc).
Peter