I had never come across the "The File Archive part of Premier Elements 12 is missing". I did some Googling and found the following that you might want to check out
Major Adobe Document
See the 4th "dot" with its content Preinstallation Errors or Problems
the link referenced.
The latter refers to the AkamiNetSession interface. I thought that more recent versions of the program were using the Adobe Download Assistant. But, check it out nonetheless. Do the download and install with antivirus and firewalls disabled.
Please let us know if any of that worked for you.