I am sorry that you are having the trouble with subscribing to Acrobat Plus.
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This "WebGet Request Failed" error message prompts when you are clicking "Download Now" in Acrobat Plus screen? Or it happens when you are trying to install Acrobat Pro using DLM.exe on your computer?
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This case has been resolved.
Customer had Norton 360 and McAfee anti-virus programs on his system that was interfering with Acrobat XI download.
Removing McAfee fixed the issue.
Thanks for the feedback and if you have future issues with Acrobat Plus please let us know and we will be happy to help you further.