The next instruction is install update acrobatupd11020.exe and, like Kashif007 above from December 8th, I got exactly that same error message in a pop-up. I've followed the instructions to the letter and have the opened/unarjed folder on my desktop.
I have the Adobe Acrobat XI Pro 11.0.20 + crack archive file which I downloaded from somewhere - no names, no packdrill lol (PB), and after a reinstall of my Win 7 Pro 64 bit OS after 3 or 4 days of exasperation, frustration and stress thanks to MS Win 10, I decided to put this on again.