So I think that I can prove to you that the problem is coming from the "Addon Manager" its self and not from P3d as you said
That's not what you proved.
As I've said, several times by now, the problem is likely some kind of issue in one of the functions of the new P3D4 PDK, which cause low fps
to some users only and no, you can't say the problem is "coming" from the Addon Manager JUST because it goes away if you disable it or it doesn't happen with a previous version.
You didn't see in the previous version, only because we didn't use some new functions which, as I've said several times by now, are 100% officially documented so, we are not doing anything wrong and we are only following the P3D4 SDK but, again, if no other addon use those functions, you are easily mislead the Addon Manager is the "problem", but it's not, the problem is likely something in the sim itself, which happens only if SOME addon is using SOME of these new features, which are quite new, so there wasn't much feedback from developers.
And, it clearly happens under some specific conditions, since (as I've said, several times by now) I was never able to reproduce it and if it happened to everybody, we would have hundreds or even thousands of reports by now, considering the number of people that downloaded the update.
As I've said, several times by now, we'll wait for 4.3 to be released, and hopefully the problem will go away.
But that's not the main reason: the main reason is, assuming I'll be able to reproduce it, which can only happen after I will finally have a Teamviewer session with some of the affected users to find out what's different with their systems, I might be eventually be able to file a bug report to LM, but it won't be considered now, with 4.3 so close to release.
About getting the old version, you can just install with the network disconnected, so you won't get the latest updates.