You will have multiple copies of the ImageEn BPL files on your system.
Search your system for any PKIE*.* and DPKIE*.* files and remove them (it might help to review the library paths under Tools > Options, Library). Then reinstall ImageEn.
OK, so this means it is trying to load DPKIECtrl29.bpl, which references PKIECtrl29.bpl, but a procedure is not found so it fails.
Sorry, but looking again at your first error message, I just realized that the method it is failing to find is from a standard VCL class (TryStringToColor in the Vcl.Graphics unit).
There was an advisory from Embarcadero about a potential for a break in binary compatibility in Delphi 12.1.
You need to install Rad Studio 12.1 Patch 1. The Delphi version should be: 29.0.51961.7529.
Another option is for you to simply recompile the ImageEn packages yourself:
I will have to try this solution when I have good access to the Internet since the download is rather large. It sounds like it worked for foxdingding though. Thanks for sticking with the problem and solving it.