Hi Howard,
That link looks incorrect, even with portal in it.
When I go to the Client Portal and look for the OE 9.3A release notes, the link is:
https://portal.softrak.com/products/reference/releasenotes/current/OE20171204.pdf This link appears to be working, and is the same link URL that Andrew posted on this thread on Jan 11, and that links works for me too.