I just reinstalled Absynth 5. I have other NI plugins, for example FM8, which is correctly installed in the VST3 folder. However Absynth 5 is not. I have an old version of Absynth 5 which is installed in the VST folder.
Absynth 5 is not VST3 only VST , Absynth 6 as VST is only VST3.
Here is a screenshot of the Absynth VST and VST3 in a DAW… :
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