sorry, i don't own castle, im just distributing it on itch. BUT, if you're curious and want the pc version, Click here! It contains every old version (pre-modern), but they changed their minds and turned it into an app where you could make homemade games and living doodles. They no longer have server support.
If you're not satisfied, download LDPlayer, download the recent castle apk, put it on LDPlayer, enter your username and password, log in, and there you go! Castle on PC (emulator required, sorry.)