I tried running it under Cspect in a rather naive way, but ... no cigar.
Viewing post in Skynet Demo (ZX Spectrum Next) comments
I've been using this emulator for quite some time. The disk image from CSpect is suitable. Run the command: mame -noreadconfig -debug -ui_active -window -plugin debugstart -skip_gameinfo -mouse_device none tbblue -hard1 C:\Users\user\Downloads\_Next\CSpect\cspect-next-2gb.img -unevenstretch -video bgfx -bgfx_screen_chains unfiltered -resolution 0x1600