I see a lot of packages.  Which ones do I need to rebuild?

There are only two packages, one run-time and one design-time, you need to install CodeSiteEx.  Depending upon your Delphi and CodeSite versions, the names of the packages you require will vary.  All packages share the same naming convention; that is:
"csx" + CodeSite version + Package type + Delphi version

CodeSite version
Package type
Delphi version

So, for example, if you are running CodeSite 2 Professional on Delphi 5, you would have to work with the csxCS2ProDsgn50.dpk and csxCS2ProRntm50.dpk packages.

Note: As with any component package set, first compile the runtime package and then compile/build the designtime package.