Go to Components menu, click it, and pick Install Packages. Click Add Packages.
Go to the folder where you installed JEDI and find the place where your BPLs are.
In my compuer that's C:\Users\Public\Documents\RAD Studio\9.0\Bpl
Type this into the filter box in the file open so you can find just the packages we want to install:
Jv*Design160.bpl
If you don't see any files that match that then your installer did not even build the .BPL files for Delphi product version 16.0. Note that the 9.0 number is the IDE version, and 16.0 is the package suffix and compiler major version, here for XE. If you were using XE2 it would be major version 17.0 (so the file suffix is 170), and so on.
Here is a picture of what it looks like when the Jedi JVCL packages are installed in your IDE:
You probably also need to locate and install some JCL packages. Use Jcl*160.BPL
as your file filter expression.
You also probably should learn about the Library Paths and go find what they were in one account, and just copy them however you like to do that. I find that using the Registry Viewer to export these keys is one way, and another is to just open the options in Delphi and copy things one at a time from one place to another. Be careful if you use the registry editor to export and import.
Also your underlying inability to compile may be a simple matter of NTFS PERMISSIONS. If you don't know what those are, you're not going to get far on Windows. Also from comments, it seems you don't know better than to try to install SOURCE CODE into C:\Program Files
folders, and then expect those folders to be writeable by regular users too. Seriously,
man, don't put code there, as Arioch said, that's not where Code goes.