I tried many 98SE boot disks online, they all boot successfully on my mobile workstation from USB (C:\>), but all can't run the Windows 98SE Installer because of XMS Memory, giving an error like: This of course happens inside of himem.sys.
It's about how to get programs like the setup to run, not about the installation itself.
I don't know what's a healthy config.sys, is there anything that makes this computer's ram work with DOS like any computer, because Hyper-V doesn't fail himem.sys under 20+ GB of ram and I've read old computers having this issue with way lower amounts.
It's clearly about the bios not supporting big ram sizes, which already was a problem in 2003/2004 pc's, but no-one seems to have experience with this.
Edit: Nothing has worked yet as of 13 February, 2021.
Specs: Vendor=Clevo, Model=P775DM3, GPU=GTX1070, Display=4K@60hz, RAM=2xDDR4-SODIMM 16GB@2.4ghz, CPU=I7-7700K@4.2ghz, EBD=USB C:\>, Bios=Aptio/AMI 1.06.09 .W10