This technote explains how to resolve a "failure reading properties file" error while installing IBM Rational TestManager.
The following error can occur in IBM Installation Manager while trying to install TestManager with a repository being accessed using UNC path.
"Failure reading properties file"
The cause can be either installing from the non-C: drive or having a space in the path to launchpad.exe
Resolving the problem
Copy or move the complete DISK1 folder (including subfolders) to a short path without spaces on the C:\ drive, for example C:\TM\DSIK1 and run launchpad.exe from there.