Hello Matt,
you are right, there is actually some data that is still written to the system disk when Biab is installed. This is also pointed out shortly before installation via the Installation Manager. Everything fine.

That's why when I reinstalled Biab 2024, I slightly changed the name of the original folder of Biab 2023 on disk "C" so that there are no system conflicts. So what needs to be written to the system disk was written when Biab 2024 (in my case on disk "K") was reinstalled, but not into the old folder, but something new was automatically created (on "C"). Now I can actually delete the old Biab folder 2023 (on "C"). Everything runs 1a. 😃👍