I went to the itch.io download page and it said that downloads are blocked in some regions, and there's an alternative mode for when this happens.
I copied some text from the Italian version of this site in case the above doesn't translate: the text I clicked said "Non parte il download?" and that showed the text "Alcuni paesi hanno bloccato il CDN di itch.io. Se il download non parte, prova ad abilitare il download alternato e poi riprova.", with an option to enable "Abilita modalità di download alternativa". Hope that helps, though I'm happy MTS worked!