Why you said the E: drive is incorrect ?
The installer allows you to chose any folder now, isn't a great feature not being forced to install inside the sim, like it used to be ? What do you mean with "I removed it ?" This sounds dangerously close to manual removing files, which you should never do.
Only use the proper Uninstaller from the Windows Control Panel, and only use the installer to remove or add.
If you don't like your first choice for the E: drive, you can Undo your choice, by uninstalling AND replying "Do you want to remove the Addon Manager ?", which will clear up the choice, so the next reinstall will again allow you to FREELY select a folder.
This folder can be anywhere you have space, it doesn't have to be inside the sim and, in fact, it would be best if it's NOT inside the sim, so you'll be able to fully uninstall\reinstall the sim without having to reinstall the scenery, at least in P3D V3.3 and above.