I am assuming you refer to the McAfee Agent 4.6 -
The steps to install manually on AIX and other Unix based operating systems is documented in the product guide page 34.
Installing on UNIX-based and Macintosh operating systems
Do you know to proceed with the steps(Manually)
Which Package to download, which command to install the agent,etc....
The link already provided should cover all those points.
If you need walking through it please open a support case so a McAfee support rep can assist directly.