Hi Maryse,
Without internet connection you disable Auto-Update functionality. For example, only few versions of recent CDISC CT are deployed during software installation process. However, all previous versions of CT are available in validation configuration. If you chose version which is still not deployed yet on your computer, then Auto-Update functionality will upload it when you start validation.
Another example of Auto-Update functionality is adding new versions of CT and validation configurations like support of new standards and rules to keep you up-to-date with FDA, PMDA and NMPA requirements. Patches for fixing application bugs is another example.
MedDRA and SNOMED are proprietary dictionaries we are not allowed to distribute. Users need to install them using their own MedDRA/SNOMED license and files. Therefore, it is not a part of Auto-Update functionality. There is no impact of internet connection to MedDRA and SNOMED.
Kind Regards,
Sergiy