Melodyne 4 compatibility

[russelaid]

Hi all,
I have a problem with Melodyne 4 essential plugin.
I use PTF and have recently purchased from avid.com marketplace melodyne 4 essential. My problem is that the plugin is not loadeding in PTF.
I did the tests on different windows 7 pc (i7 and i5 core), I tried PTF 2018.7, PTF 2019.6 and PTF 12. I also did some tests with an old version of Melodyne (editor 2). I checked that the aaxplugin file is in the correct folder (C:\Program Files\Common Files\Avid\Audio\Plug-Ins\Melodyne.aaxplugin\Contents\x64). Nothing, the plugin does not load, Melodyne works fine in standalone mode but the plugin don't load in PTF.
I bought the plugin from avid.com and not the application, can this be the problem?
Is there anyone who has had a similar problem?
Thanks.

Francesco Romoli