Hi there. Are you trying to download using the Itch App, or on the website itself? If you are trying on app, please try instead on the website.
Due to the filesize of Realms 1 & 2, we have to upload it externally, not directly to Itch. Some people have faced issues with external links on the app.
If you are using the website already, let me know and I'll work out how to get the link to you :)