Adobe issue blocking my second access to Photoshop CS6

[waterwin2]

In preparation of the move to Windows 11 I would like to install my second version on another pc. But :

Activated devices
You can install Adobe applications on more than one computer, activate them (sign in) on two, but use them on only one computer at a time. To activate apps on a third machine, you’ll need to deactivate (sign out) on one of the two current computers first.

empty state
You have no activated devices

>> How can I remove 1 of my activated devices if this list is empty ?

[D Fosse]

That sounds like the instructions for a newer Creative Cloud version. You don't have that; you have an old Creative Suite version, which is long out of support. That's why it's not listed where you're looking. Creative Cloud apps can be remotely deactivated. Creative Suite apps could not - you had to deactivate from within the application (Help > Deactivate).

As long as it's registered your CS6 should be listed somewhere else, but I don't think you can see the number of used activations.

If you still have a vacant activation slot, you don't need to do anything. Just install and it will activate silently in the background. If your two allowed activations are used - e.g. if you reinstalled without deactivating first - then it cannot be activated again.