2
Are you putting the modules exactly one directory below the modules dir? Like this:
html/modules/agendax
(there html is the main dir of Xoops)
Also, renaming the module directories is not a good idea, as some have hard-coded directory names, like $XOOPS_ROOT/modules/agendax/myfile.php, so renaming or moving the dir would make that break.
If that's not it, can you give an example of the error message you get about the missing files?
Dennis