If installing on UNIX note that Windchill requires the following:

Additionally, on UNIX systems, the shell limits for the maximum number of open file descriptors must be set to a minimum of 4096. Consult the operating system documentation or system administrator to determine how to do this in your environment.

When installing on UNIX systems, the umask value must be checked prior to running PSI. The umask must be set so that newly created files are writable. One possible umask value that might work is 022. If you are unsure what value is appropriate for your site, talk to your system administrator.