Contacted Megan in Customer Service and she explained the requirement for internet access this way.
"The internet requirement was put in place due to a software update needed for the CTR 15 year collection. For the release of the CTT collection, INM did update the software prior to the disc replication. It was decided to leave the internet requirement in place should a software update in the future arise. So, short answer is that the CTT collection can be installed without an internet connection. The requirements are mostly standard for all our collections."
So the discs will function fine without internet access, and you might only need to access the internet would be to accomplish an unlikely software update.
Bob Keller
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