I just found in my RSS feed that a new agent has been released. 10.1.0.4 for AIX5L. Well, if you go to the OEM download page, you will see only 10.1.0.2 version for AIX, HPUX, Solaris Sparc. But by clicking on the link, for example
Grid Control (10.1.0.2)
for AIX5L Based Systems, you will find a link OEM 10g Grid Control Management Agent Release 1, from there I finally discovered that 10.1.0.4 agent download.
Well, I already had 10.1.0.4, but it was a 10.1.0.2 installation patched with 10.1.0.4. So I prefer installing directly 10.1.0.4 agent.
Not trivial to found, but hopefully, I subscribed to RSS feeds on Newest Downloads