I don't know if you can move the data, that are stored here to an external drive:
OSX: /Library/Arturia/Presets
WIN: C:\ProgramData\Arturia\Presets
You'll have to try or ask Arturia about that.
This perhaps also indicate there are some fixed install paths:
https://www.arturia.com/faq/installation/uninstall-remove-a-softwareAlso please read this about VST3:
https://helpcenter.steinberg.de/hc/en-us/articles/115000171310Some plug-ins you should be able to deselect to install. I can do that on windows.
As i tried to explain in my first post, then might only be able to install 1-2 GB on another location, as the rest might be installed on fixed paths. But you can ask Arturia support.
If you can't change install paths somewhere, then how should updates be able to work correct?
Perhaps you can do what onlyleura indicate might be possible, but unless you can change install paths, then you have to do something manually at each update, and you'll need the space on your internal disk anyway. Just my thoughts.