Hi, It could be the ".com.zerog.registry.xml" file causing this problem.
The installer has to determine if this is a fresh installation or an upgrade.
By looking up the ".com.zerog.registry.xml" file, the installer can determine if an existing product exist.
That will then allow it to go the upgrade process.
If it detects there is an existing product and decided it is an upgrade, it has to find environment variable to locate the existing installation folder.
The ".com.zerog.registry.xml" file used to be created under the user's home folder but now it is created in a common location such as "/var/.com.zerog.registry.xml" so it is likely this is the problem.
You can try renaming the "/var/.com.zerog.registry.xml" file (or look up if there are other files with same filename) and try the installation again.
Then it should go into fresh install procedure.