We've all experienced it.
It starts innocently enough.
You put something in a safe place.
And then forget where the safe place was.
Thankfully, HP didn't forget! If you want to download an historical version of the HP UPD, just go here: ftp://ftp.hp.com/pub/softlib/UPD/ and download it. As of this writing (2016 Sept 9) you can get version 5.5 through 6.0, both x86 and x64 versions. for PCL5, PCL6, and PS3.
Now, to go find my wallet....