Ask here on the forum and I can usually get it for you. Or you have to call Xerox.
Essentially on Xerox.com you will only ever get a General Release
But within a short period of time there will be a Spar release.
Don't think of a spar as being beta, it isn't, it is the general release, modified to fix a bug, and in some cases add a feature or two.
The spars are built off of each other, so a fix on one should be contained within every spar release after it. Most spars have a huge amount of fixes in them, but there is no reason to always be on the latest and greatest if you don't actually have an issue (If it ain't broke don't fix it).
In your case though, make the changes I listed and do the update because:
The SHA-2 thing is going to be an issue eventually, there is no question there.
Customizing the File name and deleting the "Scanned by a Xerox" thing certainly can't hurt, but can help.