It appears that Rad Studio is not able to reach some paths that are set by the installer since it is run as administrator. I gave the installer a path that all users had access to but for some users the IDE was not able to manually install the components. Also the path that is given to the installer is not honored by the Everwood license manager.
Is there a setting somewhere in the installer to install for all users?
try to manually install all .bpl from C:\AFolder\RemObjects Software\RemObjects SDK for Delphi\Dcu\D##\Win32 via IDE menu->Components->Install Packages
I assume, that this non-admin account has read rights for C:\AFolder\RemObjects Software folder and subfolders at least.