The link from https://wiki.codeblocks.org/index.php/Main_Page (https://wiki.codeblocks.org/index.php/Main_Page)
Edit: bad link is here "Latest official release: 20.03"
Does not have trailing slash in my browser that makes a difference.
Works
https://www.codeblocks.org/downloads/binaries/
https://www.codeblocks.org/downloads/binaries/ (https://www.codeblocks.org/downloads/binaries/)
Fails
https://www.codeblocks.org/downloads/binaries
https://www.codeblocks.org/downloads/binaries (https://www.codeblocks.org/downloads/binaries)
Tim S.