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=Hydroforce%2FRepair+Videos%2FSX-12%2F&file=SX-12_Strainer_Maint.wmv

Your IP address has been logged.
3.133.138.129 (ec2-3-133-138-129.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=Hydroforce/Repair%20Videos/SX-12/