from: http://thafaker.crabdance.com/howtos/libcodesets-amiga.html

Download actual [codesets-6.22.lha](codesets-6.22.lha). You need them for Yam 2.10. And also MCC The Bar in the newest version.

Extract the archive to a temporary directory. You can install manually, see the howto below, but there is an installer that should work.

    > cd RAM:
    > lha x codesets.lha

Go to the codesets/Libs/<OS> directory where <OS> is the directory matching the operating system you want to install the library for:

    > cd codesets/Libs/AmigaOS4

copy the library out of the <OS> directory to your LIBS: directory.

    > copy codesets.library LIBS:

In case you are running an operating system from which codesets.library can't directly obtain additional charsets/codesets, you have to copy additional charset files to the LIBS:Charsets directory. (This is only required for AmigaOS3 and MorphOS):

    > cd RAM:codesets
    > copy ALL Charsets LIBS:

reboot and enjoy the new version ;)