Problem creating redirect from page with %20
If you are using the Redirect module it has an admin page for fixing 404 errors with redirects. Your file should be listed there since it gives you a 404 error.



When clicked on "Add redirect" action link, your old link will be pre-populated on the next page for you to create a redirect.



That should fix the redirect issue.

In case it doesn't try replacing white-space with + (plus) character. In the URLs + can be used instead of white-spaces.