Following error when upgrading the policy server from 12.6SP2 to 12.8 on linux:
Policy Server SP 0 is installed. Upgrades are supported from 4.51 SP05, 4.61
SP05, 5.0 SP01, 5.5 SP02, 6.0 and 12.0 . Select 'OK' to exit installation.
Release : 12.8.03
Component : SITEMINDER -WEB AGENT FOR APACHE
Solved by copying /install_config_info/ca-ps-uninstall/.com.zerog.registry.xml to the home directory of the user executing the install.