CSpect 2.19.4.4 seems to be an old version that is not available for download any more ??
It's still available here:
https://dailly.blogspot.com/2023/07/cspect-v21944.html?m=1
This is the only version that will work with 2.08 of the Next OS at the moment.
Ah, it worked okay when I downloaded it a couple of weeks ago. It looks like it could be a temporary DropBox error, but if not then Mike Dailly might have removed it for some reason. I can't find any other sites with a download (and it's probably not a good idea to trust other sources anyway).
If you don't have a Spectrum Next to play the game on, then I'm happy for you to request a refund from itch.io support.