Hi Umberto,
I apologize if my awful English made you misunderstood what I actually wanted to explain. The image attached will show exactly what I mean to say :
1) Two days ago I downloaded all of your updated installers.
2) In the meantime I left, as the ONLY active sim, Prepar 3D v3.4.22. I Installed P3D v4 only once and, immediately after, I uninstalled it. I did this only as a test. Soon after I even deleted all the Folders named LM v4 from the Users, Roaming and Local paths - just in case -.
3) So, when trying to install all FSDT products, ev'ry time pops out the window asking me where to install ev'rything.
4) As you can see, I am redirected to line 5 ("Install in Prepar 3D v3.x"), that is NOT the root folder of my actual sim, since the root folder is in the 3rd line ("Prepar 3D", as I named it), where all of your products have been properly installed up to the second to last update.
The attached image has popped out installing AddOn Manager minutes ago, letting it's proper location in ":C, Programsx86 etc. etc.).
Hope this time I was clear; but, if you're Italian not only by name, I can re-write all this pappardella in Italian language.
Thanks again,
Fulvio