Okay, so I made a second attempt, This time: 1: Uninstall all adobe acrobat products (Including non-pro versions) Then reboot the computer. 2: Go to C:\ProgramData\Adobe\, here you need to rename the folder named "SLStore" to "SLStore_old" or you can use any name of your choice. (Please note: ProgramData is a hidden folder and you may not be able to see it. Make sure the hidden files are visible on your computer, you can follow this link for the same: Show hidden files - Windows Help) 3: Go to C:\Program Files (x86)\Common Files\Adobe\SLCache. Delete all the files and folder in this folder. Make sure you don't delete the SLCache itself. 4: Go to :- C: \ Users \<user folder> \AppData \Local \ Adobe \ OOBE ,delete this folder. I also deleted the Acrobat folder from %userprofile%\AppData\Local, %userprofile%\AppData\LocalLow, %userprofile%\AppData\Roaming 5: Used CCleaner to clean registry references 6: Reboot 7: Install Acrobat DC while connected to the internet using the latest downloaded installer, entered serial number where prompted. 8: Reboot the computer without launching Acrobat DC. 9: Launch acrobat DC, Sign in with Adobe Account, accept License Terms 10: Am prompted (again) for serial number. Entered serial number. At this point the program successfully launched. Although I cannot say for sure what the defining difference is between the first attempt and second attempt. I'm suspicious the uninstaller is leaving behind some registry references that do not get overwritten on re-install? The persistent Windows-98-style reboots may also have changed things. However, this kind of unpredictable behavior has been the norm for all of our Acrobat Pro DC installs. Some work fine the first try, others take 3 or more, some take the above list of playing with hidden files and registry entries to function. Thank you for your assistance, however, I do hope the installation for serial-number versions becomes more standardized and less unpredictable with future updates, this takes an inordinate amount of time for those of us with selective use of Adobe programs in an enterprise environment.
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