This PHP Script has an Anti-Leech feature turned on.

Make sure you are accessing this file directly from www.steam-brite.com

It seems you are trying to get it from https://steam-brite.com/literature/schematics/index.php?dir=Sandia+Products%2FParts+Lists%2FHipster%2F&file=30_2002.pdf

Your IP address has been logged.
3.137.164.229 (ec2-3-137-164-229.us-east-2.compute.amazonaws.com)

Here is a link to the directory index the file is in:
http://www.steam-brite.com/literature/schematics/index.php?dir=Sandia%20Products/Parts%20Lists/Hipster/