Here is what I get with the CMD line
My P3dv4.5 is on a SSD which is my E:Drive
- In your first screenshot, you posted about an error running the UPDATER, now you are showing a screnshot of NO errors, running the INSTALLER.
- If you still get errors from the UPDATER, follow my previous instructions, which indicated how to log the UPDATER
- In your last screenshot, which shows the INSTALLER instead, it shows you can install into FSX, P3D1, 2 and 3, but you can't install into P3D4. This is of course entirely normal, since now the installer is splitted into a 32 bit installer and a 64 bit installer. So you started the 32 bit version (called gsx_fsx_setup.exe ) which doesn't install into P3D4.5, you should install the P3d4 installer instead.
However, something seems odd from your screenshot. Are you SURE you installed ALL those simulators ? P3D1 too ? That seems strange, and it might indicate your registry keys are wrong. Have you used some kind of "migration tool" to fool non compatible products to install into P3D4 ?
I provided two more screenshots of how the Addon manger is trying to install
What "Addon Manager" ? The Addon Manager is not required anymore, since 2017, when we changed to the "new" (2 years old now), Live Update.