Nach (Neu) Installation Aufforderung ein Gerät zu deaktivieren - bei "Keine aktivierten Geräte"

if this is for a perpetual license,  use the computers (if they exist, still run and can communicate with adobe's deactivation servers) with the activations and open an app > click help > deactivate.

if you've already uninstalled the app before deactivating, but still have the computer, you can reinstall on that computer and then deactivate.

there's no alternative way to deactivate.

Moving this thread to the correct community board, experts here will be able to help you better.