So, if you have FSX/P3D products, or a mix of FSX/P3D and MSFS products, you must uninstall them all and reinstall all the ones for FSX/P3D using their own normal Full installer. It's just that installing a product in FSX, P3D1,2,3,4,5 is way more complex than installing it for MSFS, so we need to test it first thoroughly before releasing it to the public.

You might wonder why this is required, if we have a new Universal Installer but it is, IF some of your products are for FSX/P3D, because the Uninstaller can't install them from scratch yet, but we'll surely add this feature in the future. On the first product you'll install, you WILL be asked to select a new destination for the Addon Manager folder, provided you replied YES to the question of the previous step. Strictly speaking, you need to uninstall ONLY your FSX/P3D products. Uninstall all the currently installed products AND ( important ) reply YES to the question 'Do you want to remove the Addon Manager ?'

In this case, it's best if you follow this procedure: Now, you say you want to relocate everything to a different drive. It will just use whatever folder structure you already set up, and will see all products installed (or not) and activated (or not) as they were. The new installer ( which for P3D and FSX is not yet an installer ), it's JUST a ( greatly ) updated version of the existing Live Update and, when it runs as an updater, it's a direct replacement for the old one.

Universal installer