Removing S7 Trail Key

I have a trail key for PLCSIM v5.3

We cannot delete it. ("Cannot be deleted because key is active")
We cannot transfer it to floppy ("Trail keys cannot be transferd to key disk")

We have license manager 2.1 hotfix 2

Any clues on how to get rid of this key.

Put the PC date forward until the key expires ?

I have the same problem with wincc flexible advanced trial license and it's alredy expired. But it doesn't matter because I have a license for standard version.

You don't have to delete the trial key.

Apparently you've run the program before installing a valid license, so the trial key was automatically installed. Just let it expire, but install a valid key first.