I am sorry, ClauS, but the ability to download and deploy local updates is limited to Creative Cloud for Team or Enterprise memberships. For individual memberships, a stable high-speed Internet connection is a requirement.
You can use the steps listed in https://helpx.adobe.com/creative-cloud/help/update-app.html to control when updates are download and installed. If the computer is portable, then you could take it to a location which does have dedicated Internet access, when any optional updates are made available.
Please be aware though, ClauS, that not all updates are optional. We do occasionally release mandatory updates to the Adobe Creative Cloud desktop application. These updates will be downloaded and applied when the computer has Internet access. You can get a sense of the timing of the updates to the Creative Cloud desktop app by reviewing the release notes at Release notes for the Adobe Creative Cloud desktop app .
Please update this public forum discussion if you have any additional questions, ClauS.