Be careful when updating Installation Manager. If it breaks, it is not as easy as just reinstalling it because you will overwrite you agentDataLocation and loose all your Installed Packages.
Particularly AIX install, I would recommend backing up /opt/IBM/InstallatonManager, /var/ibm/InstallationManager and /usr/IBM/IMShared. That way you can re-install to back to original version before problem, and recover you IM configuration So let say you break installation manager, but need to install java update to get node and appserver started. Here is command line method to install product from repository.conf via command line.
1. cd /opt/IBM/InstallationManager/eclipse/tools
2. ./imcl listAvailablePackages -repositories /data/WAS_JAVA7/7.0.7.0-WS-IBMWASJAVA/repository.config
This will result in information like this:
com.ibm.websphere.IBMJAVA.v70_7.0.7000.20140723_2129
com.ibm.websphere.liberty.IBMJAVA.v70_7.0.7000.20140723_2129
1. To install the package run command ./imcl
a. ./imcl install com.ibm.websphere.IBMJAVA.v70_7.0.7000.20140723_2129 -repositories /data/WAS_JAVA7/7.0.7.0-WS-IBMWASJAVA/repository.config -installationDirectory /usr/IBM/WebSphere8.5/AppServer -sP