Holey Moley! This really sucks.
Common issues that can result in broken links:
Some email applications may break a URL due to line breaks. You may need to cut and paste a URL from your email application into your browsers’ address bar.
2. Case sensitivity
URLs are case sensitive. “File.txt” and “file.txt” are not considered the same by the file server. You should always verify that the URL is entered in the correct case.
3. Outdated links
The web page or file you are trying to reach may have been moved to a different location or removed because the information has been superseded and/or is no longer valid.